#### § 558.128 Chlortetracycline.

(a) *Specifications.* Type A medicated articles containing either chlortetracycline calcium complex equivalent to chlortetracycline hydrochloride, or for products intended for use in milk replacer, chlortetracycline hydrochloride.

(b) *Sponsors.* See sponsors in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) as follows:

(1) *No. 054771:* 50, 70, 80, 90, or 100 grams per pound (g/lb) Type A medicated article.

(2) *No. 066104:* 10, 20, 30, 50, 70, or 100 g/lb of Type A medicated article.

(3) *No. 069254:* 50, 90, or 100 g/lb of Type A medicated article.

(c) *Related tolerances.* See [§ 556.150 of this chapter](/on/2024-09-17/title-21/section-556.150).

(d) *Special considerations.*

(1) Federal law restricts medicated feed containing this veterinary feed directive (VFD) drug to use by or on the order of a licensed veterinarian. See [§ 558.6](/on/2024-09-17/title-21/section-558.6) for additional requirements.

(2) The expiration date of VFDs for chlortetracycline medicated feeds must not exceed 6 months from the date of issuance. VFDs for chlortetracycline shall not be refilled.

(3) In milk replacers or starter feed; include on labeling the warning: “A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal.”

(4) Manufacture for use in free-choice feeds as in [paragraph (e)(4)(vi)](/on/2024-09-17/title-21/section-558.128#p-558.128(e)(4)(vi)) of this section must conform to [§ 510.455 of this chapter](/on/2024-09-17/title-21/section-510.455).

(5) When manufactured for use as in [paragraph (e)(5)(iii)](/on/2024-09-17/title-21/section-558.128#p-558.128(e)(5)(iii)) of this section, include on labeling the warning: “Psittacosis, avian chlamydiosis, or ornithosis is a reportable communicable disease, transmissible between wild and domestic birds, other animals, and man. Contact appropriate public health and regulatory officials.”

(e) *Conditions of use* —

(1) *Chickens.* It is used as follows:

| Chlortetracycline amount | Combination in grams/ton | Indications for use | Limitations | Sponsor |
| --- | --- | --- | --- | --- |
| (i) 100 to 200 g/ton | | Chickens: For control of infectious synovitis caused by *Mycoplasma synoviae* susceptible to chlortetracycline | Feed continuously for 7 to 14 days. For No. 066104: Do not feed to chickens producing eggs for human consumption | 054771 066104 069254 |
| (ii) 100 to 200 g/ton | Clopidol, 113.5 | Broiler and replacement chickens: As an aid in the prevention of coccidiosis caused by *Eimeria tenella, E. necatrix,* *E. acervulina, E. maxima,* *E. mivati,* and *E. brunetti;* and for control of infectious synovitis caused by *M. synoviae* susceptible to chlortetracycline | Feed continuously as the sole ration from the time chicks are placed in floor pens for 7 to 14 days. Do not feed to chickens over 16 weeks of age. Do not feed to chickens producing eggs for human consumption. Chlortetracycline as provided by No. 054771; clopidol as provided by No. 016592 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 016592 |
| (iii) 100 to 200 g/ton | Decoquinate, 27.2 | Chickens: For prevention of coccidiosis caused by *Eimeria tenella, E. necatrix,* *E. mivati, E. acervulina,* *E. maxima,* and *E. brunetti;* and for control of infectious synovitis caused by *M, synoviae* susceptible to chlortetracycline | Feed continuously for 7 to 14 days. Bentonite should not be used in decoquinate feeds. Do not feed to chickens producing eggs for human consumption Chlortetracycline and decoquinate as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (iv) 100 g/ton | Robenidine, 30 | Broiler and fryer chickens: As an aid in the prevention of coccidiosis caused by *E. mivati, E. brunetti,* *E. tenella, E. acervulina,* *E. maxima,* and *E. necatrix;* as an aid in the control of chronic respiratory disease (CRD) caused by *Mycoplasma gallisepticum* susceptible to chlortetracycline; and as an aid in the control of infectious synovitis caused by *M. synoviae* susceptible to chlortetracycline | Feed continuously as sole ration. Do not use this product in feeds conta Chlortetracycline and robenidine as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (v) 200 to 400 g/ton | | Chickens: For the control of chronic respiratory disease (CRD) and air sac infection caused by *M. gallisepticum* and *Escherichia coli* susceptible to chlortetracycline | Feed continuously for 7 to 14 days. For No. 066104: Do not feed to chickens producing eggs for human consumption | 054771 066104 069254 |
| (vi) 200 g/ton | Amprolium, 227 and ethopabate, 3.6 | For chickens where immunity to coccidiosis is not desired: For prevention of coccidiosis; and for treatment of chronic respiratory disease (CRD) caused by *M. gallisepticum* susceptible to chlortetracycline | Use in low calcium feed containing 0.8% dietary calcium and 1.5% sodium sulfate; feed continuously as sole ration for 7 to 14 days; do not feed to chickens producing eggs for human consumption. Chlortetracycline as provided by No. 054771; amprolium and ethopabate as provided by No. 016592 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (vii) 200 g/ton | Decoquinate, 27.2 | Broilers: As an aid in the prevention of coccidiosis caused by *Eimeria tenella, E. necatrix,* *E. acervulina, E. mivati,* *E. maxima,* and *E. brunetti;* and for the treatment of chronic respiratory disease (air sac infection) and the prevention of synovitis | Feed continuously as the sole ration for no more than 8 weeks. Use in low calcium feed containing 0.8% dietary calcium. Bentonite should not be used in decoquinate feeds. Do not feed to chickens producing eggs for human consumption Chlortetracycline and decoquinate as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (viii) 200 g/ton | Robenidine 30 | Broiler and fryer chickens: As an aid in the prevention of coccidiosis caused by *E. mivati, E. brunetti,* *E. tenella, E. acervulina,* *E. maxima,* and *E. necatrix;* as an aid in the control of chronic respiratory disease (CRD) caused by *M. gallisepticum* susceptible to chlortetracycline; and as an aid in the control of infectious synovitis caused by *M. synoviae* susceptible to chlortetracycline | Feed continuously as sole ration. Do not use this product in feeds containing bentonite. Do not feed to chickens producing eggs for human consumption. Withdraw 5 days prior to slaughter Chlortetracycline and robenidine as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (ix) 500 g/ton | | Chickens: For the reduction of mortality due to *E. coli* infections susceptible to chlortetracycline | 1. Feed for 5 days. To sponsor No. 054771 under NADA 048-761 and No. 069254 under ANADA 200-510: zero withdrawal time | 054771 069254 |
| | | | 2. Feed for 5 days; withdraw 24 hours prior to slaughter. Do not feed to chickens producing eggs for human consumption | 054771 066104 069254 |
| (x) 500 g/ton | Monensin, 90 to 110 | Chickens: As an aid in the reduction of mortality due to *E. coli* infections susceptible to chlortetracycline; and as an aid in the prevention of coccidiosis caused by *Eimeria tenella, E. necatrix,* *E. acervulina, E. maxima,* *E. brunetti,* and *E. mivati* | Feed for 5 days as the sole ration. Do not feed to laying chickens. Not to be fed continuously for more than 5 days. Do not feed to chickens over 16 weeks of age. Withdraw 24 hours before slaughter. See [§ 558.355(d) of this chapter](/on/2024-09-17/title-21/section-558.355#p-558.355(d)). Chlortetracycline as provided by No. 054771; monensin as provided by No. 058198 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 069254 |
| (xi) 500 g/ton | Robenidine, 30 | Broiler and fryer chickens: As an aid in the prevention of coccidiosis caused by *Eimeria mivati, E. brunetti,* *E. tenella, E. acervulina,* *E. maxima,* and *E. necatrix;* as an aid in the reduction of mortality due to *E. coli* susceptible to chlortetracycline | Feed continuously as sole ration for up to 5 days. Do not use this product in feeds containing bentonite. Do not feed to chickens producing eggs for human consumption. Withdraw 5 days prior to slaughter Chlortetracycline and robenidine as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (xii) 500 g/ton | Salinomycin, 40 to 60 | Broiler chickens: As an aid in the prevention of coccidiosis caused by *Eimeria tenella, E. necatrix,* *E. acervulina, E. maxima,* *E. brunetti,* and *E. mivati;* and as an aid in the reduction of mortality due to *E. coli* susceptible to chlortetracycline | For use in low calcium feeds containing 0.8% calcium. Not approved for use with pellet binders. Not to be fed continuously for more than 5 days. Do not feed to laying chickens producing eggs for human consumption. Withdraw 24 hours before slaughter. May be fatal if accidentally fed to adult turkeys or horses. Chlortetracycline as provided by Nos. 054771 or 069254; salinomycin as provided by Nos. 054771 or 016592 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 016592 054771 069254 |

(2) *Turkeys.* It is used as follows:

| Chlortetracycline amount | Combination in grams/ton | Indications for use | Limitations | Sponsor |
| --- | --- | --- | --- | --- |
| (i) 200 g/ton | | Turkeys: For control of infectious synovitis caused by *M. synoviae* susceptible to chlortetracycline | Feed continuously for 7 to 14 days. Do not feed to turkeys producing eggs for human consumption | 054771 066104 069254 |
| (ii) 400 g/ton | | 1. Turkeys: For control of hexamitiasis caused by *Hexamita meleagridis* susceptible to chlortetracycline | Feed continuously for 7 to 14 days. Do not feed to turkeys producing eggs for human consumption | 054771 066104 069254 |
| | | 2. Turkey poults not over 4 weeks of age: For reduction of mortality due to paratyphoid caused by *Salmonella typhimurium* susceptible to chlortetracycline | | 054771 066104 069254 |
| (iii) 25 mg/lb of body weight | | Turkeys: For control of complicating bacterial organisms associated with bluecomb (transmissible enteritis; coronaviral enteritis) susceptible to chlortetracycline | Feed continuously for 7 to 14 days. Do not feed to turkeys producing eggs for human consumption | 054771 066104 069254 |

(3) *Swine.* It is used as follows:

| Chlortetracycline amount | Combination in grams/ton | Indications for use | Limitations | Sponsor |
| --- | --- | --- | --- | --- |
| (i) 50 to 100 g/ton | | Swine: For reducing the incidence of cervical lymphadenitis (jowl abscesses) caused by Group E *Streptococci* susceptible to chlortetracycline | | 054771 066104 069254 |
| (ii) 400 g/ton | | Breeding swine: For the control of leptospirosis (reducing the incidence of abortion and shedding of leptospirae) caused by *Leptospira pomona* susceptible to chlortetracycline | Feed continuously for not more than 14 days | 054771 066104 069254 |
| (iii) 10 mg/lb of body weight | | Swine: For treatment of bacterial enteritis caused by *Escherichia coli* and *S. choleraesuis* and bacterial pneumonia caused by *Pasteurella multocida* susceptible to chlortetracycline; for the control of porcine proliferative enteropathies (ileitis) caused by *Lawsonia intracellularis* susceptible to chlortetracycline | Feed approximately 400 g/ton, varying with body weight and feed consumption to provide 10 mg/lb per day. Feed for not more than 14 days. Withdraw 5 d prior to slaughter for sponsor No. 069254 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 066104 069254 |
| (iv) 10 mg/lb of body weight | Bacitracin methylenedisalicylate, 10 to 30 | Swine: For treatment of bacterial enteritis caused by *E. coli* and *S. choleraesuis* and bacterial pneumonia caused by *P. multocida* susceptible to chlortetracycline; for the control of porcine proliferative enteropathies (ileitis) caused by *Lawsonia intracellularis* susceptible to chlortetracycline; and for increased rate of weight gain and improved feed efficiency | Feed approximately 400 g/ton, varying with body weight and feed consumption to provide 10 mg/lb per day. Feed for not more than 14 days. Chlortetracycline and bacitracin methylenedisalicylate as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (v) 10 mg/lb of body weight | Bacitracin methylenedisalicylate, 10 to 30 | Swine: For treatment of bacterial enteritis caused by *E. coli* and *S. choleraesuis* and bacterial pneumonia caused by *P. multocida* susceptible to chlortetracycline; and for increased rate of weight gain and improved feed efficiency | Feed chlortetracycline at approximately 400 g/ton of feed, varying with body weight and food consumption, to provide 10 mg/lb of body weight. Feed for not more than 14 days. Withdraw 5 d prior to slaughter for sponsor No. 069254. Bacitracin methylenedisalicylate provided by No. 054771; chlortetracycline provided by Nos. 054771 and 069254 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 069254 |
| (vi) 10 mg/lb of body weight | Tiamulin hydrogen fumarate, 35 | For control of swine dysentery associated with *Brachyspira* (formerly *Serpulina* or *Treponema*) *hyodysenteriae* susceptible to tiamulin and for treatment of swine bacterial enteritis caused by *E. coli* and *Salmonella choleraesuis* sensitive to chlortetracycline and treatment of bacterial pneumonia caused by *P. multocida* sensitive to chlortetracycline | Feed chlortetracycline at approximately 400 g/ton of feed, varying with body weight and food consumption, to provide 10 mg/lb of body weight. Feed continuously as the sole ration for 14 days. Withdraw medicated feed 2 days before slaughter. Tiamulin as provided by Nos. 058198 or 069254 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 058198 069254 |

(4) *Cattle.* It is used as follows:

| Chlortetracycline amount | Combination in grams/ton | Indications for use | Limitations | Sponsor |
| --- | --- | --- | --- | --- |
| (i) to provide 70 mg/head/day | | Growing cattle (over 400 lb): For reduction of liver condemnation due to liver abscesses | Feed to provide chlortetracycline at the rate of 70 mg per animal daily. A withdrawal period has not been established in pre-ruminating calves. Do not use in calves to be processed for veal | 054771 066104 069254 |
| (ii) 5.83 to 14 g/ton to provide 70 mg/head/day | Melengestrol acetate, 0.25 to 2 g/ton to provide 0.25 to 0.5 mg melengestrol acetate per head per day | Growing beef heifers fed in confinement for slaughter (over 400 lb): For reduction of the incidence of liver abscesses, increased rate of weight gain, improved feed efficiency, and suppression of estrus (heat) | Melengestrol acetate Type C top-dress medicated feed must be top dressed onto or mixed at feeding with the Type C medicated feed containing 5.83 to 14 g/ton chlortetracycline. Chlortetracycline and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (iii) 7 to 17.5 g/ton | Monensin, 5 to 40 | Growing beef steers and heifers fed in confinement for slaughter over 400 lb: For reduction of the incidence of liver abscesses and for improved feed efficiency | Feed as the sole ration to provide 70 mg chlortetracycline per head per day and 50 to 480 mg monensin per head per day. No additional improvement in feed efficiency has been shown from feeding monensin at levels greater than 30 grams per ton (360 mg monensin per head per day). For use in dry feeds only. Not for use in liquid feed supplements. Do not allow horses or other equines access to feed containing monensin. Ingestion of monensin by horses has been fatal. Monensin medicated cattle and goat feeds are safe for use in cattle and goats only. Consumption by unapproved species may result in toxic reactions. Do not exceed the levels of monensin recommended in the feeding directions, as reduced average daily gains may result. If feed refusals containing monensin are fed to other groups of cattle, the concentration of monensin in the refusals and amount of refusals fed should be taken into consideration to prevent monensin overdosing. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal. Monensin as provided by Nos. 016592 and 058198, chlortetracycline by No. 069254 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 016592 069254 |
| (iv) 7 to 17.5 g/ton | Monensin, 10 to 40 | Growing beef steers and heifers fed in confinement for slaughter over 400 lb: For reduction of the incidence of liver abscesses and for prevention and control of coccidiosis due to *Eimeria bovis* and *Eimeria zuernii* | Feed as the sole ration to provide 70 mg chlortetracycline per head per day and 0.14 to 0.42 mg monensin per lb. body weight per day to provide, depending upon severity of coccidiosis challenge, up to 480 mg monensin per head per day. For use in dry feeds only. Not for use in liquid feed supplements. Do not allow horses or other equines access to feed containing monensin. Ingestion of monensin by horses has been fatal. Monensin medicated cattle and goat feeds are safe for use in cattle and goats only. Consumption by unapproved species may result in toxic reactions. Do not exceed the levels of monensin recommended in the feeding directions, as reduced average daily gains may result. If feed refusals containing monensin are fed to other groups of cattle, the concentration of monensin in the refusals and amount of refusals fed should be taken into consideration to prevent monensin overdosing. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal. Monensin as provided by Nos. 016592 and 058198, chlortetracycline by No. 069254 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 016592 069254 |
| (v) to provide 0.5 mg/lb of body weight daily | | Beef cattle (over 700 lb): For control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline | Feed to provide chlortetracycline at the rate of 0.5 mg per pound of body weight daily. Withdraw 48 hours prior to slaughter. To sponsor Nos. 054771 and 069254: Zero withdrawal time | 054771 066104 069254 |
| (vi) 33.33 to 50 g/ton to provide 0.5 mg/lb of body weight per day | Melengestrol acetate, 0.5 to 2 g/ton to provide 0.5 mg melengestrol acetate per head per day | Replacement beef heifers over 700 lb: For control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline and for suppression of estrus (heat) | Melengestrol acetate Type C top-dress medicated feed must be top dressed onto or mixed at feeding with a Type C medicated feed containing 33.33 to 50 g/ton chlortetracycline. Feeding a Type C top-dress medicated feed containing melengestrol acetate shall not exceed 24 days. Chlortetracycline and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (vii) 25 to 1,100 g/ton to provide 0.5 mg/lb of body weight daily | Lasalocid, 30 to 600 | Pasture cattle (slaughter, stocker, feeder cattle, beef replacement heifers) over 700 pounds: For control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline; and for increased rate of weight gain | Feed continuously on a hand-fed basis 0.5 mg chlortetracycline per lb. body weight per day and not less than 60 mg or more than 300 mg lasalocid per head daily in at least 1 pound of feed. Daily lasalocid intakes in excess of 200 mg/head/day in pasture cattle have not been shown to be more effective than 200 mg lasalocid/head/day. Do not allow horses or other equines access to feeds containing lasalocid. No withdrawal period is required. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Lasalocid as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 069254 |
| (viii) 25 to 1,100 g/ton to provide 0.5 mg/lb of body weight daily | Lasalocid, 30 to 600; melengestrol acetate, 0.5 to 2 g/ton to provide 0.5 mg/head/day melengestrol acetate | Replacement beef heifers on pasture over 700 pounds: For control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline, increased rate of weight gain, and suppression of estrus (heat) | The melengestrol acetate Type C top-dress medicated feed must be top dressed onto or mixed at feeding with a Type C medicated feed containing 25 to 1,100 g/ton of chlortetracycline and 30 to 600 g/ton lasalocid to provide 0.5 mg chlortetracycline per lb body weight per day and not less than 60 mg or more than 300 mg lasalocid per head per day in at least 1 pound of feed. Do not exceed 24 days of feeding. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Chlortetracycline, lasalocid, and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (ix) 33.33 to 66.67 g/ton | Monensin, 5 to 40 | Growing beef steers and heifers fed in confinement for slaughter over 700 lbs: For control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline and for improved feed efficiency | Feed as the sole ration to provide 0.5 mg chlortetracycline per lb. body weight per day and 50 to 480 mg monensin per head per day. No additional improvement in feed efficiency has been shown from feeding monensin at levels greater than 30 grams per ton (360 mg monensin per head per day). For use in dry feeds only. Not for use in liquid feed supplements. Do not allow horses or other equines access to feed containing monensin. Ingestion of monensin by horses has been fatal. Monensin medicated cattle and goat feeds are safe for use in cattle and goats only. Consumption by unapproved species may result in toxic reactions. Do not exceed the levels of monensin recommended in the feeding directions, as reduced average daily gains may result. If feed refusals containing monensin are fed to other groups of cattle, the concentration of monensin in the refusals and amount of refusals fed should be taken into consideration to prevent monensin overdosing. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal. Monensin as provided by Nos. 016592 and 058198, chlortetracycline by No. 069254 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 016592 069254 |
| (x) 33.33 to 66.67 g/ton | Monensin, 10 to 40 | Growing beef steers and heifers fed in confinement for slaughter over 700 lbs: For control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline and for the prevention and control of coccidiosis due to *Eimeria bovis* and *Eimeria zuernii* | Feed as the sole ration to provide 0.5 mg chlortetracycline per lb. body weight per day and 0.14 to 0.42 mg monensin per lb. body weight per day to provide, depending upon severity of coccidiosis challenge, up to 480 mg monensin per head per day. For use in dry feeds only. Not for use in liquid feed supplements. Do not allow horses or other equines access to feed containing monensin. Ingestion of monensin by horses has been fatal. Monensin medicated cattle and goat feeds are safe for use in cattle and goats only. Consumption by unapproved species may result in toxic reactions. Do not exceed the levels of monensin recommended in the feeding directions, as reduced average daily gains may result. If feed refusals containing monensin are fed to other groups of cattle, the concentration of monensin in the refusals and amount of refusals fed should be taken into consideration to prevent monensin overdosing. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal. Monensin as provided by Nos. 016592 and 058198, chlortetracycline by No. 069254 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 016592 069254 |
| (xi) 50 to 117 g/ton | Monensin, 7.14 to 40 | Growing beef steers and heifers fed in confinement for slaughter under 700 lbs: For control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline and for improved feed efficiency | Feed as the sole ration to provide 350 mg chlortetracycline per head per day and 50 to 480 mg monensin per head per day. No additional improvement in feed efficiency has been shown from feeding monensin at levels greater than 30 grams per ton (360 mg monensin per head per day). For use in dry feeds only. Not for use in liquid feed supplements. Do not allow horses or other equines access to feed containing monensin. Ingestion of monensin by horses has been fatal. Monensin medicated cattle and goat feeds are safe for use in cattle and goats only. Consumption by unapproved species may result in toxic reactions. Do not exceed the levels of monensin recommended in the feeding directions, as reduced average daily gains may result. If feed refusals containing monensin are fed to other groups of cattle, the concentration of monensin in the refusals and amount of refusals fed should be taken into consideration to prevent monensin overdosing. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal. Monensin as provided by Nos. 016592 and 058198, chlortetracycline by No. 069254 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 016592 069254 |
| (xii) 50 to 117 g/ton | Monensin, 10 to 40 | Growing beef steers and heifers fed in confinement for slaughter under 700 lbs: For control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline and for the prevention and control of coccidiosis due to *Eimeria bovis* and *Eimeria zuernii* | Feed as the sole ration to provide 350 mg chlortetracycline per head per day and 0.14 to 0.42 mg monensin per lb. body weight per day to provide, depending upon severity of coccidiosis challenge, up to 480 mg monensin per head per day. For use in dry feeds only. Not for use in liquid feed supplements. Do not allow horses or other equines access to feed containing monensin. Ingestion of monensin by horses has been fatal. Monensin medicated cattle and goat feeds are safe for use in cattle and goats only. Consumption by unapproved species may result in toxic reactions. Do not exceed the levels of monensin recommended in the feeding directions, as reduced average daily gains may result. If feed refusals containing monensin are fed to other groups of cattle, the concentration of monensin in the refusals and amount of refusals fed should be taken into consideration to prevent monensin overdosing. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal. Monensin as provided by Nos. 016592 and 058198, chlortetracycline by No. 069254 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 016592 069254 |
| (xiii) 50 to 117 g/ton | Monensin, 7.14 to 40 | Growing beef steers and heifers fed in confinement for slaughter: For the control of bacterial pneumonia associated with shipping fever complex caused by *Pasteurella* spp. susceptible to chlortetracycline and for improved feed efficiency | Feed as the sole ration to provide 350 mg chlortetracycline per head per day and 50 to 480 mg monensin per head per day. No additional improvement in feed efficiency has been shown from feeding monensin at levels greater than 30 grams per ton (360 mg monensin per head per day). For use in dry feeds only. Not for use in liquid feed supplements. Do not allow horses or other equines access to feed containing monensin. Ingestion of monensin by horses has been fatal. Monensin medicated cattle and goat feeds are safe for use in cattle and goats only. Consumption by unapproved species may result in toxic reactions. Do not exceed the levels of monensin recommended in the feeding directions, as reduced average daily gains may result. If feed refusals containing monensin are fed to other groups of cattle, the concentration of monensin in the refusals and amount of refusals fed should be taken into consideration to prevent monensin overdosing. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal. Monensin as provided by Nos. 016592 and 058198, chlortetracycline by No. 069254 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 016592 069254 |
| (xiv) 50 to 117 g/ton | Monensin, >10 to 40 | Growing beef steers and heifers fed in confinement for slaughter: For the control of bacterial pneumonia associated with shipping fever complex caused by *Pasteurella* spp. susceptible to chlortetracycline and for the prevention and control of coccidiosis due to *Eimeria bovis* and *Eimeria zuernii* | Feed as the sole ration to provide 350 mg chlortetracycline per head per day and 0.14 to 0.42 mg monensin per lb. body weight per day to provide, depending upon severity of coccidiosis challenge, up to 480 mg monensin per head per day. For use in dry feeds only. Not for use in liquid feed supplements. Do not allow horses or other equines access to feed containing monensin. Ingestion of monensin by horses has been fatal. Monensin medicated cattle and goat feeds are safe for use in cattle and goats only. Consumption by unapproved species may result in toxic reactions. Do not exceed the levels of monensin recommended in the feeding directions, as reduced average daily gains may result. If feed refusals containing monensin are fed to other groups of cattle, the concentration of monensin in the refusals and amount of refusals fed should be taken into consideration to prevent monensin overdosing. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal. Monensin as provided by Nos. 016592 and 058198, chlortetracycline by No. 069254 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 016592 069254 |
| (xv) to provide 0.5 to 2.0 mg/lb of body weight daily | | Beef cattle and nonlactating dairy cattle: As an aid in the control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline | In Type C free-choice cattle feeds such as feed blocks or salt-mineral mixes manufactured from approved Type A articles. See [paragraph (d)(4)](/on/2024-09-17/title-21/section-558.128#p-558.128(d)(4)) of this section | 054771 |
| (xvi) to provide 10 mg/lb of body weight daily | | Calves, beef and nonlactating dairy cattle: For treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* organisms susceptible to chlortetracycline | Feed approximately 400 g/ton, varying with body weight and feed consumption to provide 10 mg/lb per day. Treat for not more than 5 days. To sponsor No. 054771 (NADAs 048-761 and 046-699) and to sponsor No. 069254 (ANADA 200-510): May be mixed in the cattle's daily ration or administered as a top-dress. In feed including milk replacers withdraw 10 days prior to slaughter. To sponsor No. 054771 under NADA 046-699: 24-hour withdrawal period. To sponsor No. 054771 under NADA 048-761 and No. 069254 under ANADA 200-510: Zero withdrawal period. See [paragraph (d)(3)](/on/2024-09-17/title-21/section-558.128#p-558.128(d)(3)) of this section | 054771 066104 069254 |
| (xvii) to provide 10 mg/lb of body weight daily | | Calves (up to 250 lb): For the treatment of bacterial enteritis caused by Escherichia coli susceptible to chlortetracycline | A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal | 066104 |
| (xviii) 400 to 2,000 g/ton | Monensin, 5 to 40 | Growing beef steers and heifers fed in confinement for slaughter: For treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* susceptible to chlortetracycline; for improved feed efficiency | Feed as the sole ration to provide 10 mg chlortetracycline per lb. body weight per day and 50 to 480 mg monensin per head per day. Feed for not more than 5 days, then continue feeding monensin Type C medicated feed alone. No additional improvement in feed efficiency has been shown from feeding monensin at levels greater than 30 grams per ton (360 mg monensin per head per day). For use in dry feeds only. Not for use in liquid feed supplements. Do not allow horses or other equines access to feed containing monensin. Ingestion of monensin by horses has been fatal. Monensin medicated cattle and goat feeds are safe for use in cattle and goats only. Consumption by unapproved species may result in toxic reactions. Do not exceed the levels of monensin recommended in the feeding directions, as reduced average daily gains may result. If feed refusals containing monensin are fed to other groups of cattle, the concentration of monensin in the refusals and amount of refusals fed should be taken into consideration to prevent monensin overdosing. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal. Monensin as provided by Nos. 016592 and 058198, chlortetracycline by No. 069254 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 016592 069254 |
| (xix) 400 to 2,000 g/ton | Monensin, 10 to 40 | Growing beef steers and heifers: For treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* susceptible to chlortetracycline; and for the prevention and control of coccidiosis due to *Eimeria bovis* and *Eimeria zuernii* | Feed as the sole ration to provide 10 mg chlortetracycline per lb. body weight per day and 0.14 to 0.42 mg monensin per lb. body weight per day to provide, depending upon severity of the coccidiosis challenge, up to 480 mg monensin per head per day. Feed for not more than 5 days, then continue feeding monensin Type C medicated feed alone. For use in dry feeds only. Not for use in liquid feed supplements. Do not allow horses or other equines access to feed containing monensin. Ingestion of monensin by horses has been fatal. Monensin medicated cattle and goat feeds are safe for use in cattle and goats only. Consumption by unapproved species may result in toxic reactions. Do not exceed the levels of monensin recommended in the feeding directions, as reduced average daily gains may result. If feed refusals containing monensin are fed to other groups of cattle, the concentration of monensin in the refusals and amount of refusals fed should be taken into consideration to prevent monensin overdosing. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal. Monensin as provided by Nos. 016592 and 058198, chlortetracycline by No. 069254 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 016592 069254 |
| (xx) 400 to 2,000 g/ton | Monensin, 10 to 200 | Beef calves 2 months of age and older: For treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* susceptible to chlortetracycline; and for the prevention and control of coccidiosis due to *Eimeria bovis* and *Eimeria zuernii* | Feed as the sole ration to provide 10 mg chlortetracycline per lb. body weight per day and 0.14 to 1.00 mg monensin per lb. body weight per day to provide, depending upon severity of coccidiosis challenge, up to 200 mg of monensin per head per day. Feed for not more than 5 days, then continue to feed monensin Type C medicated feed alone. For use in dry feeds only. Not for use in liquid feed supplements. Do not allow horses or other equines access to feed containing monensin. Ingestion of monensin by horses has been fatal. Monensin medicated cattle and goat feeds are safe for use in cattle and goats only. Consumption by unapproved species may result in toxic reactions. Do not exceed the levels of monensin recommended in the feeding directions, as reduced average daily gains may result. If feed refusals containing monensin are fed to other groups of cattle, the concentration of monensin in the refusals and amount of refusals fed should be taken into consideration to prevent monensin overdosing. A withdrawal period has not been established for this product in preruminating calves. Do not use in calves to be processed for veal. Monensin as provided by Nos. 016592 and 058198, chlortetracycline by No. 069254 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 016592 069254 |
| (xxi) 400 to 2,000 g/ton | Monensin, 15 to 84 | Replacement beef and dairy heifers: For treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* susceptible to chlortetracycline; and for the prevention and control of coccidiosis caused by *Eimeria bovis* and *Eimeria zuernii* | For replacement beef and dairy heifers not currently being fed monensin: Feed as the sole ration for not more than 5 days to provide 10 mg chlortetracycline per pound of body weight per day and 0.14 to 0.42 mg monensin per pound of body weight per day, depending upon severity of challenge, to provide 50 to 100 mg monensin per head per day in a minimum of 1 pound of Type C medicated feed. After 5 days, continue to feed monensin Type C medicated feed alone to provide 50 to 200 mg monensin per head per day in a minimum of 1 pound of Type C medicated feed For replacement beef and dairy heifers currently being fed monensin: Feed as the sole ration for not more than 5 days to provide 10 mg chlortetracycline per pound of body weight per day and 0.14 to 0.42 mg monensin per pound of body weight per day, depending upon severity of challenge, to provide 50 to 200 mg monensin per head per day in a minimum of 1 pound of Type C medicated feed. After 5 days, continue to feed monensin Type C medicated feed alone | 069254 |
| | | | This drug is not approved for use in female dairy cattle 20 months of age or older, including dry dairy cows. Use in these cattle may cause drug residues in milk and/or in calves born to these cows. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal | |
| | | | Monensin as provided by No. 058198, chlortetracycline by No. 069254 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | |
| (xxii) 400 to 2,000 g/ton | Monensin, 15 to 400 | Replacement beef and dairy heifers: For treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* susceptible to chlortetracycline; and for increased rate of weight gain | For replacement beef and dairy heifers not currently being fed monensin: Feed as the sole ration for not more than 5 days to provide 10 mg chlortetracycline per pound of body weight per day and 50 to 100 mg monensin per head per day in a minimum of 1 pound of Type C medicated feed. After 5 days, continue to feed monensin Type C medicated feed alone to provide 50 to 200 mg monensin per head per day in a minimum of 1 pound of Type C medicated feed For replacement beef and dairy heifers currently being fed monensin: Feed as the sole ration for not more than 5 days to provide 10 mg chlortetracycline per pound of body weight per day and 50 to 200 mg monensin per head per day in a minimum of 1 pound of Type C medicated feed. After 5 days, continue to feed monensin Type C medicated feed alone | 069254 |
| | | | This drug is not approved for use in female dairy cattle 20 months of age or older, including dry dairy cows. Use in these cattle may cause drug residues in milk and/or in calves born to these cows. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal | |
| | | | Monensin as provided by No. 058198, chlortetracycline by No. 069254 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | |
| (xxiii) 500 to 2,000 g/ton to provide 10 mg/lb of body weight daily | Laidlomycin, 5 | Cattle fed in confinement for slaughter: For treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* organisms susceptible to chlortetracycline; and for increased rate of weight gain and improved feed efficiency | Feed continuously at a rate of 30 to 75 mg laidlomycin propionate potassium per head per day for not more than 5 days. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. See [§ 558.305(d) of this chapter](/on/2024-09-17/title-21/section-558.305#p-558.305(d)). Laidlomycin as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (xxiv) 500 to 4,000 g/ton to provide 10 mg/lb of body weight daily | Laidlomycin, 5 to 10 | Cattle fed in confinement for slaughter: For treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* organisms susceptible to chlortetracycline; and for improved feed efficiency | Feed continuously at a rate of 30 to 75 mg laidlomycin propionate potassium per head per day for not more than 5 days. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. See [§ 558.305(d) of this chapter](/on/2024-09-17/title-21/section-558.305#p-558.305(d)). Laidlomycin as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (xxv) 500 to 2,000 to provide 10 mg/lb of body weight daily | Lasalocid, 10 to 30 | Cattle fed in confinement for slaughter: For treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* organisms susceptible to chlortetracycline; and for improved feed efficiency | Feed continuously in complete feed for not more than 5 days to provide 10 mg chlortetracycline per lb. body weight per day and not less than 100 mg or more than 360 mg lasalocid per head per day. Do not allow horses or other equines access to feeds containing lasalocid. No withdrawal period is required. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Lasalocid as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 069254 |
| (xxvi) 500 to 1,200 g/ton to provide 10 mg/lb of body weight daily | Lasalocid, 25 to 30 | Cattle fed in confinement for slaughter: For treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* organisms susceptible to chlortetracycline; and for increased rate of weight gain and improved feed efficiency | Feed continuously in complete feed to provide 10 mg chlortetracycline per lb body weight and not less than 250 mg or more than 360 mg lasalocid per head per day. Do not allow horses or other equines access to feeds containing lasalocid. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Lasalocid as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (xxvii) 500 to 4,000 to provide 10 mg/lb of body weight daily | Lasalocid, 30 to 600 | Pasture cattle (slaughter, stocker, feeder cattle, dairy and beef replacement heifers): For treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* organisms susceptible to chlortetracycline; and for increased rate of weight gain | Feed continuously on a hand-fed basis for not more than 5 days to provide 10 mg chlortetracycline per lb. body weight per day and not less than 60 mg or more than 300 mg lasalocid per head per day in at least 1 pound of feed. Daily lasalocid intakes in excess of 200 mg/head/day in pasture cattle have not been shown to be more effective than 200 mg lasalocid/head/day. Do not allow horses or other equines access to feeds containing lasalocid. No withdrawal period is required. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Lasalocid as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 069254 |
| (xxviii) 500 to 4,000 g/ton to provide 10 mg/lb of body weight daily | Lasalocid, 30 to 600: Melengestrol acetate, 0.5 to 2 g/ton to provide 0.5 mg/head/day melengestrol acetate | Replacement dairy heifers on pasture less than 20 months of age and replacement beef heifers on pasture: For treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* organisms susceptible to chlortetracycline, increased rate of weight gain, and suppression of estrus (heat) | The melengestrol acetate Type C top-dress medicated feed must be top dressed onto or mixed at feeding with a Type C medicated feed containing 500 to 4,000 g/ton of chlortetracycline and 30 to 600 g/ton lasalocid to provide 10 mg chlortetracycline per lb body weight per day and not less than 60 mg or more than 300 mg lasalocid per head per day in at least 1 pound of feed for not more than 5 days. After completing feeding of this combination, continue feeding a Type C top-dress medicated feed containing melengestrol acetate alone for a total time not exceeding 24 days of feeding. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Chlortetracycline, lasalocid, and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (xxix) 500 to 4,000 g/ton | | Calves, beef and nonlactating dairy cattle: For the treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* susceptible to chlortetracycline | Hand feed continuously for not more than 5 days to provide 10 mg/lb body weight per day. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. To sponsor No. 054771 under NADA 046-699: 24-hour withdrawal period. To sponsor No. 054771 under NADA 048-761 and No. 069254 under ANADA 200-510: Zero withdrawal period | 054771 069254 |
| (xxx) 500 to 4,000 g/ton | Decoquinate, 12.9 to 90.8 | Calves, beef and non-lactating dairy cattle: For the treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* organisms susceptible to chlortetracycline; and for the prevention of coccidiosis caused by *Eimeria bovis* and *E. zuernii* | Feed at a rate of 1g chlortetracycline per 100 lb body weight/day and 22.7 mg decoquinate per 100 lb of body weight/day for not more than 5 days. When it is fully consumed, resume feeding 22.7 mg decoquinate per 100 lb of body weight/day for a total of 28 days to prevent coccidiosis. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. Do not feed to animals producing milk for food. Decoquinate as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 069254 |
| (xxxi) 500 to 4,000 to provide 10 mg per pound of body weight | Melengestrol acetate, 0.25 to 2 g/ton to provide 0.25 to 0.5 mg melengestrol acetate per head per day | Growing beef heifers fed in confinement for slaughter: For the treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* organisms susceptible to chlortetracycline, increased rate of weight gain, improved feed efficiency, and suppression of estrus (heat) | Melengestrol acetate Type C top-dress medicated feed must be top dressed onto or mixed at feeding with a Type C medicated feed containing 500 to 4,000 g/ton chlortetracycline for not more than 5 days. After completing feeding of this combination, continue feeding a Type C top-dress medicated feed containing melengestrol acetate alone. Chlortetracycline and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (xxxii) 500 to 4,000 to provide 10 mg per pound of body weight | Melengestrol acetate, 0.5 to 2 g/ton to provide 0.5 mg melengestrol acetate per head per day | Replacement dairy heifers less than 20 months of age and replacement beef heifers: For the treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* organisms susceptible to chlortetracycline, and for suppression of estrus (heat) | Melengestrol acetate Type C top-dress medicated feed must be top dressed onto or mixed at feeding with a Type C medicated feed containing 500 to 4,000 g/ton chlortetracycline for not more than 5 days. After completing feeding of this combination, continue feeding a Type C top-dress medicated feed containing melengestrol acetate alone for a total time not exceeding 24 days. Use in dairy heifers less than 20 months of age may cause drug residues in milk and/or in calves born to these cows. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. Chlortetracycline and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (xxxiii) 4,000 to 20,000 g/ton | | Calves, beef and nonlactating dairy cattle: For the treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* organisms susceptible to chlortetracycline | Administer as a top dress, varying with body weight and feed consumption, to provide 10 mg/lb per day. Treat for not more than 5 days. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal | 054771 069254 |
| (xxxiv) 4,000 to 20,000 g/ton | Decoquinate, 90.8 to 535.7 | Calves, beef and non-lactating dairy cattle: For the treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* organisms susceptible to chlortetracycline; and for the prevention of coccidiosis caused by *Eimeria bovis* and *E. zuernii* | Feed at a rate of 1g chlortetracycline per 100 lb body weight/day and 22.7 mg decoquinate per 100 lb of body weight/day for not more than 5 days. When it is fully consumed, resume feeding 22.7 mg decoquinate per 100 lb of body weight/day for a total of 28 days to prevent coccidiosis. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. Do not feed to animals producing milk for food. Decoquinate as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 069254 |
| (xxxv) 4,000 to 20,000 g/ton to provide 10 mg/lb of body weight per day | Melengestrol acetate, 0.25 to 2 g/ton to provide 0.25 to 0.5 mg melengestrol acetate per head per day | Growing beef heifers fed in confinement for slaughter: For the treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* organisms susceptible to chlortetracycline, and for increased rate of weight gain, improved feed efficiency, and suppression of estrus (heat) | Top dress 0.5 to 2 pounds of this medicated feed containing both drugs onto or mix at feeding with a non-medicated feed for not more than 5 days. After completing feeding of this combination, continue feeding a Type C top-dress medicated feed containing melengestrol acetate alone. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. Chlortetracycline and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (xxxvi) 4,000 to 20,000 g/ton to provide 10 mg/lb of body weight per day | Melengestrol acetate, 0.5 to 2 g/ton to provide 0.5 mg melengestrol acetate per head per day | Replacement dairy heifers less than 20 months of age and replacement beef heifers: For the treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* organisms susceptible to chlortetracycline, and for suppression of estrus (heat) | Top dress 0.5 to 2 pounds of this medicated feed containing both drugs onto or mix at feeding with a non-medicated feed for not more than 5 days. After completing feeding of this combination, continue feeding a Type C top-dress medicated feed containing melengestrol acetate alone for a total time not exceeding 24 days. Use in dairy heifers less than 20 months of age may cause drug residues in milk and/or in calves born to these cows. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. Chlortetracycline and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (xxxvii) to provide 350 mg/head/day | | Beef cattle: For control of bacterial pneumonia associated with shipping fever complex caused by *Pasteurella* spp. susceptible to chlortetracycline | Feed to provide chlortetracycline at the rate of 350 mg per animal daily. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. Withdrawal periods: To sponsor No. 054771 under NADAs 046-699 and 049-287, No. 066104 under NADA 092-286, and No. 069254 under NADA 048-480: Withdraw 48 hours prior to slaughter. To sponsor No. 054771 under NADA 048-761 and No. 069254 under NADA 138-935 and ANADA 200-510: Zero withdrawal period | 054771 066104 069254 |
| (xxxviii) to provide 350 mg/head/day | | Beef cattle (under 700 lb): For control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline | Feed to provide chlortetracycline at the rate of 350 mg per animal daily. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. Withdrawal periods: To sponsor No. 054771 under NADAs 046-699 and 049-287, No. 066104 under NADA 092-286, and No. 069254 under NADA 048-480: Withdraw 48 hours prior to slaughter. To sponsor No. 054771 under NADA 048-761 and No. 069254 under NADA 138-935 and ANADA 200-510: Zero withdrawal period | 054771 066104 069254 |
| (xxxix) 50 to 350 g/ton to provide 350 mg/head/day | Melengestrol acetate, 0.5 to 2 g/ton to provide 0.5 mg melengestrol acetate per head per day | Replacement beef heifers under 700 lb: For control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline and for suppression of estrus (heat) | Melengestrol acetate Type C top-dress medicated feed must be top dressed or mixed at feeding with the Type C medicated feed containing 50 to 350 g/ton chlortetracycline for up to 24 days of feeding. Do not exceed 24 days of feeding. Chlortetracycline and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (xl) 20 to 350 g/ton | | Beef cattle and replacement dairy heifers: For control of bacterial pneumonia associated with shipping fever complex caused by *Pasteurella* spp. susceptible to chlortetracycline | Feed to provide chlortetracycline at the rate of 350 mg per head per day. This drug is not approved for use in female dairy cattle 20 months of age or older, including dry dairy cows. Use in these cattle may cause drug residues in milk and/or in calves born to these cows. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. To sponsor No. 054771 under NADA 048-761 and No. 069254 under ANADA 200-510: Zero withdrawal period | 054771 069254 |
| (xli) 20 to 350 g/ton to provide 350 mg/head/day | Melengestrol acetate, 0.25 to 2 g/ton to provide 0.25 to 0.5 mg melengestrol acetate per head per day | Growing beef heifers fed in confinement for slaughter: For control of bacterial pneumonia associated with shipping fever complex caused by *Pasteurella* spp. susceptible to chlortetracycline, increased rate of weight gain, improved feed efficiency, and suppression of estrus (heat) | Melengestrol acetate Type C top-dress medicated feed must be top dressed onto or mixed at feeding with the Type C medicated feed containing 20 to 350 g/ton chlortetracycline. Chlortetracycline and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (xlii) 20 to 350 g/ton to provide 350 mg/head/day | Melengestrol acetate, 0.5 to 2 g/ton to provide 0.5 mg melengestrol acetate per head per day | Replacement dairy heifers less than 20 months of age and replacement beef heifers: For control of bacterial pneumonia associated with shipping fever complex caused by *Pasteurella* spp. susceptible to chlortetracycline and suppression of estrus (heat) | Melengestrol acetate Type C top-dress medicated feed must be top dressed or mixed at feeding with the Type C medicated feed containing 20 to 350 g/ton chlortetracycline. Use in dairy heifers less than 20 months of age may cause drug residues in milk and/or in calves born to these cows. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. Chlortetracycline and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (xliii) 23.3 to 58.3 g/ton to provide 350 mg/head/day | Laidlomycin, 5 | Cattle fed in confinement for slaughter: For control of bacterial pneumonia associated with shipping fever complex caused by *Pasteurella* spp. susceptible to chlortetracycline; and for increased rate of weight gain and improved feed efficiency | Feed continuously at a rate of 30 to 75 mg laidlomycin propionate potassium per head per day. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. See [§ 558.305(d) of this chapter](/on/2024-09-17/title-21/section-558.305#p-558.305(d)). Laidlomycin as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (xliv) 14.6 to 116.7 g/ton to provide 350 mg/head/day | Laidlomycin, 5 to 10 | Cattle fed in confinement for slaughter: For control of bacterial pneumonia associated with shipping fever complex caused by *Pasteurella* spp. susceptible to chlortetracycline; and for improved feed efficiency | Feed continuously at a rate of 30 to 75 mg laidlomycin propionate potassium per head per day. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. See [§ 558.305(d) of this chapter](/on/2024-09-17/title-21/section-558.305#p-558.305(d)). Laidlomycin as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (xlv) 25 to 42.2 g/ton to provide 350 mg/head/day | Lasalocid, 25 to 30 | Cattle under 700 pounds fed in confinement for slaughter: For control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline; and for increased rate of weight gain and improved feed efficiency | Feed continuously in complete feed at a rate of 350 mg chlortetracycline and not less than 250 mg nor more than 360 mg lasalocid per head daily. Do not allow horses or other equines access to feeds containing lasalocid. No withdrawal period is required. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Lasalocid as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 069254 |
| (xlvi) 25 to 42.2 g/ton to provide 350 mg/head/day | Lasalocid, 25 to 30 | Cattle fed in confinement for slaughter: For control of bacterial pneumonia associated with shipping fever complex caused by *Pasteurella multocida* organisms susceptible to chlortetracycline; and for increased rate of weight gain and improved feed efficiency | Feed continuously in complete feed at a rate of 350 mg chlortetracycline and not less than 250 mg nor more than 360 mg lasalocid per head daily. Do not allow horses or other equines access to feeds containing lasalocid. No withdrawal period is required. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Lasalocid as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 069254 |
| (xlvii) 25 to 100 g/ton to provide 350 mg/head/day | Lasalocid, 10 to 30 | Cattle under 700 pounds fed in confinement for slaughter: For control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline; and for improved feed efficiency | Feed continuously in complete feed at a rate of 350 mg chlortetracycline and not less than 100 mg nor more than 360 mg lasalocid per head daily. Do not allow horses or other equines access to feeds containing lasalocid. No withdrawal period is required. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Lasalocid as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 069254 |
| (xlviii) 25 to 100 g/ton to provide 350 mg/head/day | Lasalocid, 10 to 30 | Cattle fed in confinement for slaughter: For control of bacterial pneumonia associated with shipping fever complex caused by *Pasteurella multocida* organisms susceptible to chlortetracycline; and for improved feed efficiency | Feed continuously in complete feed at a rate of 350 mg chlortetracycline and not less than 100 mg nor more than 360 mg lasalocid per head daily. Do not allow horses or other equines access to feeds containing lasalocid. No withdrawal period is required. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Lasalocid as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 069254 |
| (xlix) 25 to 700 to provide 350 g/head/day | Lasalocid, 30 to 600 | Pasture cattle (slaughter, stocker, feeder cattle, dairy and beef replacement heifers): For control of bacterial pneumonia associated with shipping fever complex caused by *Pasteurella multocida* organisms susceptible to chlortetracycline; and for increased rate of weight gain | Feed continuously on a hand-fed basis at a rate of 350 mg chlortetracycline and not less than 60 mg nor more than 300 mg lasalocid per head per day in at least 1 pound of feed. Daily lasalocid intakes in excess of 200 mg/head/day in pasture cattle have not been shown to be more effective than 200 mg lasalocid/head/day. Do not allow horses or other equines access to feeds containing lasalocid. No withdrawal period is required. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Lasalocid as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 069254 |
| (l) 25 to 700 g/ton to provide 350 mg/head/day | Lasalocid, 30 to 600; melengestrol acetate, 0.5 to 2 g/ton to provide 0.5 mg/head/day melengestrol acetate | Replacement beef heifers on pasture: For control of bacterial pneumonia associated with shipping fever complex caused by *Pasteurella* spp. susceptible to chlortetracycline, increased rate of weight gain, and suppression of estrus (heat) | The melengestrol acetate Type C top-dress medicated feed must be top dressed onto or mixed at feeding with a Type C medicated feed containing 25 to 700 g/ton of chlortetracycline and 30 to 600 g/ton lasalocid to provide 350 mg chlortetracycline per head daily and not less than 60 mg or more than 300 mg lasalocid per head daily in at least 1 pound of feed. Do not exceed 24 days of feeding. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Chlortetracycline, lasalocid, and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (li) 25 to 700 to provide 350 mg/head/day | Lasalocid, 30 to 600 | Pasture cattle (slaughter, stocker, feeder cattle, beef replacement heifers) under 700 pounds: For control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline; and for increased rate of weight gain | Feed continuously on a hand-fed basis at a rate of 350 mg chlortetracycline and not less than 60 mg nor more than 300 mg lasalocid per head per day in at least 1 pound of feed. Daily lasalocid intakes in excess of 200 mg/head/day in pasture cattle have not been shown to be more effective than 200 mg lasalocid/head/day. Do not allow horses or other equines access to feeds containing lasalocid. No withdrawal period is required. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Lasalocid as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 069254 |
| (lii) 25 to 700 g/ton to provide 350 mg/head/day | Lasalocid, 30 to 600; melengestrol acetate, 0.5 to 2 g/ton to provide 0.5 mg/head/day melengestrol acetate | Replacement beef heifers on pasture under 700 pounds: For control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline, increased rate of weight gain, and suppression of estrus (heat) | The melengestrol acetate Type C top-dress medicated feed must be top dressed onto or mixed at feeding with a Type C medicated feed containing 25 to 700 g/ton of chlortetracycline and 30 to 600 g/ton lasalocid to provide 350 mg chlortetracycline per head daily and not less than 60 mg or more than 300 mg lasalocid per head daily in at least 1 pound of feed. Do not exceed 24 days of feeding. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Chlortetracycline, lasalocid, and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (liii) 25 to 2,800 to provide 350 mg/head/day | Lasalocid, 30 to 181.8 | Beef cattle weighing under 700 pounds: For control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline; and for the control of coccidiosis caused by *Eimeria bovis* and *E. zuernii* | Hand feed continuously at a rate of 350 mg chlortetracycline and 1 mg lasalocid per 2.2 lb. body weight daily to cattle with a maximum of 360 mg of lasalocid per head per day. Do not allow horses or other equines access to feeds containing lasalocid. No withdrawal period is required. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Chlortetracycline and lasalocid as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 069254 |
| (liv) 25 to 2,800 g/ton to provide 350 mg/head/day | Lasalocid, 30 to 181.8; melengestrol acetate, 0.25 to 2 g/ton to provide 0.25 to 0.5 mg/head/day melengestrol acetate | Growing beef heifers fed in confinement for slaughter under 700 pounds: For control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline, control of coccidiosis caused by *Eimeria bovis* and *E. zuernii,* increased rate of weight gain, improved feed efficiency, and suppression of estrus (heat) | The melengestrol acetate Type C top-dress medicated feed must be top dressed onto or mixed at feeding with a Type C medicated feed containing 25 to 2,800 g/ton of chlortetracycline and 30 to 181.8 g/ton lasalocid to provide 350 mg chlortetracycline per head per day and 1 mg lasalocid per 2.2 lb. of body weight daily with a maximum of 360 mg lasalocid per head per day. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Chlortetracycline, lasalocid, and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (lv) 25 to 2,800 to provide 350 mg/head/day | Lasalocid, 30 to 181.8 | Beef cattle weighing up to 800 pounds: For control of bacterial pneumonia associated with shipping fever complex caused by *Pasteurella* spp. susceptible to chlortetracycline; and for the control of coccidiosis caused by *Eimeria bovis* and *E. zuernii* | Hand feed continuously at a rate of 350 mg chlortetracycline and 1 mg lasalocid per 2.2 lb. body weight daily to cattle with a maximum of 360 mg of lasalocid per head per day. Do not allow horses or other equines access to feeds containing lasalocid. No withdrawal period is required. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Lasalocid as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 069254 |
| (lvi) 25 to 2,800 g/ton to provide 350 mg/head/day | Lasalocid, 30 to 181.8; melengestrol acetate, 0.25 to 2 g/ton to provide 0.25 to 0.5 mg/head/day melengestrol acetate | Growing beef heifers fed in confinement for slaughter up to 800 pounds: For control of bacterial pneumonia associated with shipping fever complex caused by *Pasteurella* spp. susceptible to chlortetracycline, control of coccidiosis caused by *Eimeria bovis* and *E. zuernii,* increased rate of weight gain, improved feed efficiency, and suppression of estrus (heat) | The melengestrol acetate Type C top-dress medicated feed must be top dressed onto or mixed at feeding with a Type C medicated feed containing 25 to 2,800 g/ton of chlortetracycline and 30 to 181.8 g/ton lasalocid to provide 350 mg chlortetracycline per head daily and 1 mg lasalocid per 2.2 lb. of body weight daily with a maximum of 360 mg lasalocid per head per day. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Chlortetracycline, lasalocid, and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (lvii) 25 to 2,800 g/ton to provide 350 mg/head/day | Lasalocid, 30 to 181.8; melengestrol acetate, 0.5 to 2 g/ton to provide 0.5 mg/head/day melengestrol acetate | Replacement beef heifers up to 800 pounds: For control of bacterial pneumonia associated with shipping fever complex caused by *Pasteurella* spp. susceptible to chlortetracycline, control of coccidiosis caused by *Eimeria bovis* and *E. zuernii,* and suppression of estrus (heat) | The melengestrol acetate Type C top-dress medicated feed must be top dressed onto or mixed at feeding with a Type C medicated feed containing 25 to 2,800 g/ton of chlortetracycline and 30 to 181.8 g/ton lasalocid to provide 350 mg chlortetracycline per head daily and 1 mg lasalocid per 2.2 lb. of body weight daily with a maximum of 360 mg lasalocid per head per day. Do not exceed 24 days of feeding. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Chlortetracycline, lasalocid, and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (lviii) 500 to 4,000 to provide 10 mg/head/day | Lasalocid, 30 to 181.8 | Cattle weighing up to 800 pounds: For the treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* susceptible to chlortetracycline; and for the control of coccidiosis caused by *Eimeria bovis* and *E. zuernii* | Hand feed continuously for not more than 5 days at a rate of 10 mg chlortetracycline and 1 mg lasalocid per 2.2 lb. body weight daily to cattle with a maximum of 360 mg of lasalocid per head per day. Do not allow horses or other equines access to feeds containing lasalocid. No withdrawal period is required. A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Lasalocid as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 069254 |
| (lix) 500 to 4,000 g/ton to provide 10 mg/lb of body weight daily | Lasalocid, 30 to 181.8; melengestrol acetate, 0.25 to 2 g/ton to provide 0.25 to 0.5 mg/head/day melengestrol acetate | Growing beef heifers fed in confinement for slaughter up to 800 pounds: For the treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* organisms susceptible to chlortetracycline, control of coccidiosis caused by *Eimeria bovis* and *E. zuernii,* increased rate of weight gain, improved feed efficiency, and suppression of estrus (heat) | The melengestrol acetate Type C top-dress medicated feed must be top dressed onto or mixed at feeding with a Type C medicated feed containing 500 to 4,000 g/ton of chlortetracycline and 30 to 181.8 g/ton lasalocid to provide 10 mg chlortetracycline per lb of body weight per day and 1 mg lasalocid per 2.2 lb of body weight per day with a maximum of 360 mg lasalocid per head per day for not more than 5 days of feeding. After completing feeding of this combination, continue feeding a Type C top-dress medicated feed containing melengestrol acetate alone. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Chlortetracycline, lasalocid, and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |
| (lx) 500 to 4,000 g/ton to provide 10 mg/lb of body weight daily | Lasalocid, 30 to 181.8; melengestrol acetate, 0.5 to 2 g/ton to provide 0.5 mg/head/day melengestrol acetate | Replacement dairy heifers up to 800 pounds and less than 20 months of age and replacement beef heifers up to 800 pounds: For the treatment of bacterial enteritis caused by *Escherichia coli* and bacterial pneumonia caused by *Pasteurella multocida* organisms susceptible to chlortetracycline, control of coccidiosis caused by *Eimeria bovis* and *E. zuernii,* and suppression of estrus (heat) | The melengestrol acetate Type C top-dress medicated feed must be top dressed onto or mixed at feeding with a Type C medicated feed containing 500 to 4,000 g/ton of chlortetracycline and 30 to 181.8 g/ton lasalocid to provide 10 mg chlortetracycline per lb of body weight per day and 1 mg lasalocid per 2.2 lb of body weight per day with a maximum of 360 mg lasalocid per head per day for not more than 5 days. After completing feeding of this combination, continue feeding a Type C top-dress medicated feed containing melengestrol acetate alone. See [§ 558.311(d) of this chapter](/on/2024-09-17/title-21/section-558.311#p-558.311(d)). Chlortetracycline, lasalocid, and melengestrol as provided by No. 054771 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)) | 054771 |

(5) *Minor species.* It is used as follows:

| Chlortetracycline amount | Indications for use | Limitations | Sponsor |
| --- | --- | --- | --- |
| (i) 80 mg/head/day | Breeding sheep; reducing the incidence of (vibrionic) abortion caused by *Campylobacter fetus* infection susceptible to chlortetracycline | | 054771 066104 069254 |
| (ii) 200 to 400 g/ton | Ducks: For the control and treatment of fowl cholera caused by *Pasteurella multocida* susceptible to chlortetracycline | Feed in complete ration to provide from 8 to 28 mg/lb of body weight per day, depending upon age and severity of disease, for not more than 21 days. Do not feed to ducks producing eggs for human consumption | 054771 069254 |
| (iii) 10 mg/g of finished feed daily | Psittacine birds (cockatoos, macaws, and parrots) suspected or known to be infected with psittacosis caused by *Chlamydia psittaci* sensitive to chlortetracycline | Feed continuously for 45 days. Each bird should consume daily an amount of medicated feed equal to one fifth of its body weight. See [paragraph (d)(5)](/on/2024-09-17/title-21/section-558.128#p-558.128(d)(5)) of this section | 054771 069254 |

(6) It is used as a free-choice, loose mineral Type C feed as follows:

(i) *Specifications.*

| Ingredient | Percent | International feed No. |
| --- | --- | --- |
| Dicalcium Phosphate | 46.20 | 6-26-335 |
| Sodium Chloride (Salt) | 15.00 | 6-04-152 |
| Magnesium Oxide | 10.67 | 6-02-756 |
| Cottonseed Meal | 10.00 | 5-01-625 |
| Trace Mineral/Vitamin Premix1 | 3.80 | |
| Calcium Carbonate | 3.50 | 6-01-069 |
| Dried Cane Molasses | 3.00 | 4-04-695 |
| Potassium Chloride | 2.00 | 6-03-755 |
| Mineral Oil | 2.00 | 8-03-123 |
| Iron Oxide | 0.50 | 6-02-431 |
| Chlortetracycline Type A medicated article (90 gram/lb) | 3.33 | |
| | | |
| --- | --- | --- |
| 1 Content of vitamin and trace mineral premixes may be varied. However, they should be comparable to those used for other free-choice feeds. Formulation modifications require FDA approval prior to marketing. Selenium must comply with [21 CFR 573.920](/on/2024-09-17/title-21/section-573.920). Ethylenediamine dihydroiodide (EDDI) should comply with FDA Compliance Policy Guides Sec. 651.100 (CPG 7125.18). | | |

(ii) *Amount.* 6,000 grams per ton.

(iii) Indications for use. Beef and nonlactating dairy cattle: As an aid in the control of active infection of anaplasmosis caused by *Anaplasma marginale* susceptible to chlortetracycline.

(iv) *Limitations.* Feed continuously on a free-choice basis at a rate of 0.5 to 2.0 mg chlortetracycline per pound of body weight per day.

(v) *Sponsors.* See Nos. 054771 and 069254 in [§ 510.600(c) of this chapter](/on/2024-09-17/title-21/section-510.600#p-510.600(c)).

[[81 FR 94995](https://www.federalregister.gov/citation/81-FR-94995), Dec. 27, 2016, as amended at [82 FR 21691](https://www.federalregister.gov/citation/82-FR-21691), May 10, 2017; [82 FR 43485](https://www.federalregister.gov/citation/82-FR-43485), Sept. 18, 2017; [83 FR 13636](https://www.federalregister.gov/citation/83-FR-13636), Mar. 30, 2018; [83 FR 14588](https://www.federalregister.gov/citation/83-FR-14588), Apr. 5, 2018; [83 FR 48947](https://www.federalregister.gov/citation/83-FR-48947), Sept. 28, 2018; [83 FR 64741](https://www.federalregister.gov/citation/83-FR-64741), Dec. 18, 2018; [84 FR 8975](https://www.federalregister.gov/citation/84-FR-8975), Mar. 13, 2019; [84 FR 39185](https://www.federalregister.gov/citation/84-FR-39185), Aug. 9, 2019; [86 FR 13189](https://www.federalregister.gov/citation/86-FR-13189), Mar. 8, 2021; [86 FR 14822](https://www.federalregister.gov/citation/86-FR-14822), Mar. 19, 2021; [86 FR 17064](https://www.federalregister.gov/citation/86-FR-17064), Apr. 1, 2021; [86 FR 57999](https://www.federalregister.gov/citation/86-FR-57999), Oct. 20, 2021; [86 FR 61686](https://www.federalregister.gov/citation/86-FR-61686), Nov. 8, 2021; [87 FR 58963](https://www.federalregister.gov/citation/87-FR-58963), Sept. 29, 2022; [87 FR 76422](https://www.federalregister.gov/citation/87-FR-76422), Dec. 14, 2022; [88 FR 14901](https://www.federalregister.gov/citation/88-FR-14901), Mar. 10, 2023; [88 FR 55567](https://www.federalregister.gov/citation/88-FR-55567), Aug. 16, 2023; [89 FR 14411](https://www.federalregister.gov/citation/89-FR-14411), Feb. 27, 2024]