Feed additive composition for ruminants

Abstract: A feed additive composition containing a biologically active substance which is stable in the rumen of ruminants while allowing its efficient digestion and absorption in the abomasum and its subsequent digestive tract is provided. The feed additive composition for ruminants according to this invention is characterized in that a core which contains a biologically active substance is coated with a coating composition which contains at least a) and b) below. a) at least one substance selected from the group consisting of linear or branched saturated or unsaturated aliphatic monocarboxylic acids of 12-22 carbon atoms or salts thereof, hardened vegetable fats and oils, hardened animal fats and oils and wax; and b) a substance indicated in i) and/or ii) below. i) one or more linear or branched saturated or unsaturated aliphatic monocarboxylic acids or 11 carbon atoms or less, and ii) one or more substances selected from the group consisting of nucleic acids, nucleotides, nucleosides, bases composing nucleic acids and salts thereof.

Description: The present invention relates to a feed additive composition for ruminants. More specifically, it relates to a feed additive composition for ruminants wherein a biologically active substance is coated with a composition which is stable in the rumen of ruminants but allows the release of the biologically active substance in the abomasum and it's subsequent digestive tract, thus making possible the digestion of the biologically active substance in the abomasum and it's subsequent digestive tract. Description of the Related Art When biologically active substances such as amino acids, vitamins and the like are orally administered to ruminants such as cattle and sheep, the majority thereof are decomposed by microorganisms in the rumen, and are not utilized effectively. Accordingly, it is important to make the biologically active substances pass through the rumen without decomposition by microorganisms in the rumen and to make them effectively digested and absorbed in the abomasum and it's subsequent digestive tract in the field of feeds, nutrient preparations, medicines, etc. for ruminants. Feed additives for ruminants containing biologically active substances have been proposed in the past which are coated with fatty acids with 12 or more carbon atoms, hardened animal or vegetable fats and oils, etc. But these particles coated with fats and oils are so stable not only in the rumen, but also in the abomasum and it's subseqent digestive tract, that the biologically active substances are not easily released in the abomasum and the subsequent digestive tract. For this reason, some methods of adding to protective coatings substances propelling the release of the biologically active substances in the abomasum and it's subsequent digestive tract were proposed. In these methods, the biologically active substances are dispersed in coating materials and are granulated or are coated with the coating materials. A method for the dispersion of a biologically active substance in a protective substance has been proposed in, for example, Japanese Unexamined Patent Application 168351/85A , for producing granules containing a biologically active substance, 20% by weight or more of calcium carbonate and 10% by weight or more of an aliphatic monocarboxylic acid of 14 or more carbon atoms, a hardened fat and oil, etc. Also, in Japanese Examined Patent Application 10780/84B there is proposed a method for dispersing 30-50% by weight of a bioiogically active substance in a protective substance comprising 10-35% by weight of a salt of an aliphatic monocarboxylic acid of 14-22 carbon atoms or ricinoleic acid and the remainder comprising an aliphatic monocarboxylic acid of 14-22 carbon atoms, ricinoleic acid, hardened fats and oils, or the like. A method for coating a biologically active substance with a protective substance is proposed in, for example, Japanese Unexamined Patent Application 317053/88A, whereby a biologically active substance is coated with a protective substance which comprises an aliphatic monocarboxylic acid of 12-24 carbon atoms, a hardened fat and oil, lecithin, and a glycerin fatty acid ester. JP-A-03254643 discloses a method for protecting a biologically active substance from the gastric juice in the rumen of a ruminant by coating the biologically active substance with an oily substance having a melting point of less than 40°C, then adding a powder of a metal salt of an aliphatic monocarboxylic acid having at least 8 carbon atoms, and granulating the resultant mixture. However, in these methods for the dispersion of biologically active substances in protective substances, since the biologically active substance is present near the particle surface, it is necessary to significantly lower the content of the biologically active substance for its protection, and considering that, in the case of water soluble biologically active substances, the residence time in the rumen is from a few dozen hours to a few days, sufficient protection thereof is difficult to provide. In addition, when coating is done using a protective coating consisting of lecithin, a glycerol fatty acid ester, and a fat and an oil, the insufficient strength of the coating layer leaves the problem of poor protection. Furthermore, lecithin and glycerol fatty acid esters are expected to have an emulsifying effect on the fat and oil, but considering the time of passage through the abomasum and it's subsequent digestive tract thereafter, the degree of release cannot be said to be sufficient. In addition, a method has been proposed for providing a coating using a synthesized polymer which is insoluble in the enviroment of the rumen, but is soluble in the strongly acidic abomasum, in order to make use of the difference in pH of the rumen and the abomasum, but considering the fact that the use of an organic solvent for the coating leads to a high cost of the coating agent, as well as other factors, it cannot be said to be a fully adequate method. Subject Matter of the Invention The subject matter of the present invention is to stably protect biologically active substances in the rumen of ruminants while allowing their efficient digestion and absorption in the abomasum and it's subsequent digestive tract, giving due consideration to safety and economy. Means to Accomplish the Subject Matter The inventors of the present invention have discovered that it is possible to combine both excellent stability in the rumen and excellent release in the abomasum and it's subsequent digestive tract, by coating a core which contains a biologically active substance, with coating composition which contains one or more linear or branched saturated or unsaturated aliphatic monocarboxylic acids of 11 carbon atoms or less, (hereunder abbreviated to "lower fatty acids") and/or one or more substances selected from the group consisting of nucleic acids, nucleotides, nucleosides, bases composing nucleic acids and salts thereof (hereunder abbreviated to "nucleic acid-related substances"), and a substance selected from the group consisting of linear or branched saturated or unsaturated aliphatic monocarboxylic acids of 12-22 carbon atoms and salts thereof, hardened vegetable fats and oils, hardened animal fats and oils, and wax, and thus the present invention has been completed. That is, the gist of the present invention is a feed additive composition for ruminants, characterized in that a core which contains a biologically active substance is coated with a coating composition which contains at least a) and b): a) at least one substance selected from the group consisting of linear or branched saturated or unsaturated aliphatic monocarboxylic acids of 12-22 carbon atoms or salts thereof, hardened vegetable fats and oils, hardened animal fats and oils, and wax; and b) a substance indicated in i) and/or ii) below. i) a lower fatty acid, and ii) a nucleic acid-related substance wherein the coating composition contains component b) in a proportion of 1 to 20% by weight of the entire coating composition. According to the present invention, the biologically active substance may be any type of well-known nutrient preparation, or a feed or medicine which contains it, for example, one or a mixture of two or more substances selected from the group consisting of amino acids and their derivatives, hydroxy homologous compounds of amino acids, proteins, carbohydrates, vitamins and veterinary medicines. Specifically, amino acids such as lysine, methionine, tryptophan and threonine; amino acid derivatives such as N-acylaminoacids, calcium salt of N-hydroxymethylmethionine and lysine hydrochloride; hydroxy homologous compounds of amino acids, such as 2-hydroxy-4-methylmercaptobutyric acid and salts thereof; natural nutrient powders such as grain powder, feather powder and fish powder; proteins such as casein, corn protein and potato protein; carbohydrates such as starch, cane suger, sucrose and glucose; vitamins such as vitamin A, vitamin A acetate, vitamin A palmitate, Vitamins B, thiamine, thiamine hydrochloride, riboflavin, nicotinic acid, nicotinic acid amide, calcium pantothenate, choline pantothenate, pyridoxine hydrochloride, cholinechloride, cyanocobalamine, biotin, folic acid, p-aminobenzoic acid, vitamin D2, vitamin D3, vitamin E and substances having similar functions; antibiotics such as tetracycline antibiotics, aminoglycoside antibiotics, macrolide antibiotics, and polyether antibiotics; insecticides such as negfon; vermicides such as piperazine; and hormones such as estrogen, stilbestrol, hexestrol, tyroprotein and goitrogen may be used. There is no particular restriction on the method for the preparation of the core containing the biologically active substance, and granules, preferably granules close to spherical in shape may be prepared by a commonly used granulating method, for example, the extrusion granulation method, the fluidized granulation method, or the stirring granulation method, adding, if necessary, a binder and/or a filler. The binder to be used may be a cellulose derivative such as hydroxypropyl cellulose, methyl cellulose, sodium carboxymethyl cellulose, a vinyl derivative such as polyvinyl alcohol, polyvinylpyrrolidone, or gum arabic, guaiac gum, or sodium polyacrylate. The filler to be used may be starch, protein, or crystalline cellulose. The coating composition to coat the core which contains the above mentioned biologically active substance(s) contains at least one substance selected from the group consisting of linear or branched saturated or unsaturated aliphatic monocarboxylic acids of 12-22 carbon atoms or salts thereof, hardened vegetable fats and oils, hardened animal fats and oils and wax, lower fatty acids and nucleic acid-related substances. Also, other known disintegrating agents, for example, inorganic substances which are stable in neutral conditions but become soluble in acidic conditions, chitosan, emulsifiers, e.g. lecithin, may also be included. The aliphatic monocarboxylic acid of 12-22 carbon atoms to be used may be myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, behenic acid, or a salt thereof. The hardened vegetable oil may be hardened palm oil, hardened soybean oil, hardened rapeseed oil, or hardened castor oil; the hardened animal oil may be hardened beef tallow, or hardened lard; the wax may be carnauba wax, bees wax natural wax, synthetic wax and paraffin wax. The lower fatty acid to be used may be a fatty acid such as undecylic acid, capric acid, caprylic acid, caproic acid, or a mixture thereof, and the nucleic acid-related substance may be RNA, inosine, guanine, adenosine, or a mixture thereof. In addition, when using these substances, there is no restriction on their purity. The coating composition according to the present invention contains the lower fatty acid or nucleic acid-related substance at a proportion of 1-20%, and preferably 3-15% by weight of the entire coating composition. If the content of these substances in the coating composition exceeds 20%, then the strength of the coating layer is reduced, thus reducing the degree of protection in the rumen. Further, if the proportion by weight is not at least 1% by weight then the degree of release in the abomasum and it's subsequent digestive tract is reduced. The feed additive composition for ruminants according to the present invention is characterized in that a core which contains any of the biologically active substances mentioned above is coated with the above mentioned coating composition. There is no particularly restriction on the amount of the coating composition used, but a smaller amount is preferable since the content of the biologically active substance may be increased thereby; however, it is necessary that the amount be able to sufficiently protect the biologically active substance in the rumen, and normally the coating is used at 10-200 parts by weight, and preferably 15-150 parts by weight, to 100 parts by weight of the core containing the biologically active substance. Furthermore, the feed additive composition for ruminants according to the present invention preferably has a specific gravity adjusted within the range of 1.0 - 1.5 to speed its passage through the rumen, but in cases where the specific gravity cannot be adjusted within this range due to the coating of the above mentioned coating composition, a specific gravity adjusting agent may be included in the coating composition and/or in the core which contains the biologically active substance. The specific gravity adjusting agent to be used may be calcium carbonate, calcium phosphate, kaolin, or talc. There is no particularly restriction on the method of coating, and any common coating method, for example, the fluidized-bed coating method, the pan coating method, or the melt coating method may be used. A more detailed description will now be provided regarding the present invention with reference to the Examples and Comparisons. Examples The degree of usefulness as a feed additive for ruminant animals was evaluated according to the following method. Stability in the rumen Of a prepared sample, about 2 g was placed into a 200 ml Erlenmeyer flask, 100 ml of a McDougall buffer solution corresponding to the rumen juice was poured therein, and the flask was shaken at a temperature of 39°C for 24 hours. After completion of the shaking, the degree of release of the biologically active substance was analyzed to calculate the stability in the rumen. In cases where the biologically active substance was an amino acid, the amount thereof released in the Examples was analyzed by liquid chromatography. McDougall buffer solution: A buffer solution prepared by dissolving the following reagents in 1000 ml of water. Sodium bicarbonate : 7.43 g Disodium phosphate · 12H 2 O : 7.00 g Sodium chloride : 0.34 g Potassium chloride : 0.43 g Magnesium chloride · 6H 2 O : 0.10 g Calcium chloride : 0.05 g Dissolving property in the abomasum After the stability test, the shaken sample was recovered and the adhered solution was washed off, after which it was placed into a 200 ml Erlenmeyer flask, 40 ml of a Clark-Lubs buffer solution corresponding to the abomasum juice was poured therein, and the flask was shaken at a temperature of 39° C for 1 hour. After completion of the shaking, the degree of release of the biologically active substance was analyzed. Clark-Lubs buffer solution: A buffer solution prepared by dissolving the following reagents in 1000 ml of water. Potassium chloride: 3.73 g Hydrochloric acid: 2.1 ml Dissolving property in the small intestine After the dissolving property inside the abomasum, was tested, the shaken sample was recovered and placed into a 200 ml Erlenmeyer flask, 100 ml of a buffer solution corresponding to the small intestinal juice was poured therein, and the flask was shaken at a temperature of 39°C for 7 hours. After completion of the shaking, the degree of release of the biologically active substance was analyzed, and the degree of release in the above mentioned abomasum solution was added to the degree of release in the small intestinal solution to calculate the degree of release in the abomasum and it's subsequent digestive tract (hereunder referred to as "digestive tract release rate"). [Preparation of Core (A) containing L-lysine hydrochloride] A 325 g portion of L-lysine hydrochloride, 172.5 g of talc, 2.5 g of sodium carboxymethylcellulose and 135 g of water were charged into a kneader and kneaded, after which an extruder having a screen with an opening size of 1.5mm was used to obtain cylindrically-shaped granules. The obtained granules were formed into granules similar to spherical shape using a spherical granule producing machine (Marumerizer, Fuji Paudal Co., Ltd). The resulting spherical granules were subjected to fluidized drying to obtain cores containing L-lysine hydrochloride. [Preparation of Core (B) containing D,L-methionine] A 375 g portion of D,L-methionine, 120 g of talc, 5 g of sodium carboxymethylcellulose and 150 g of water were charged into a kneader and kneaded, after which an extruder having a screen with an opening size of 1.5mm was used to obtain cylindrically-shaped granules. The obtained granules were formed into granules similar to a spherical shape using a spherical granule producing machine (Marumerizer, Fuji Paudal Co. Ltd.). The resulting spherical granules were subjected to fluidized drying to obtain cores containing D,L-methionine. Example 1 To 95 parts by weight of the melted hardened beef tallow (m.p. 61°C) was added 5 parts by weight of capric acid (carbon number 10), and this mixed coating composition was coated onto Core (A) at a proportion of 43 parts by weight to 100 parts by weight of the core (coating ratio 30%). The coating was effected using a fluidized-bed coater (New Marumerizer, Fuji Paudal Co. Ltd.). The rumen stomach release rate and the digestive tract release rate for this feed additive composition for ruminant animals, determined according to the above mentioned evaluation test, are shown in Table 1. Example 1 2 3 4 5 6 7 8 Core A A A A A A B B Parts by weight (core) 100 100 100 100 100 100 100 100 Parts by weight (coating layer) 43 67 43 43 43 43 33 33 Coating layer composition (%) Hardened beef tallow 95 95 90 97 95 90 95 90 Capric acid 5 5 10 - - - 5 Caprylic acid - - - 3 5 10 - 10 Release rate (%) Rumen 7 3 14 5 8 18 6 11 Digestive tract (abomasum + small intestine) 55 61 58 48 30 59 55 54 Examples 2-8 Feed additive compositions for ruminant animals having the cores, coating compositions and amounts shown in Table 1 were prepared in the same manner as in Example 1, and the results of the evaluation test are shown in Table 1. Example 9 To 95 parts by weight of the melted hardened beef tallow (m.p. 61°C) was added 5 parts by weight of RNA (trade name "Sanyo Nucleic Acid", product of Sanyo Kokusaku Pulp, Inc.), and this mixed coating composition was coated onto Core (A) at a proportion of 43 parts by weight to 100 parts by weight of the core (coating ratio 30%). The coating was effected using a fluidised-bed coater (New Marumerizer, Fuji Paudal Co. Ltd.). The rumen release rate and the digestive tract release rate for this feed additive composition for ruminant animals, determined according to the above mentioned evaluation test, are shown in Table 2. Example 9 10 11 12 13 14 15 16 Core A A A A A A B B Parts by weight (core) 100 100 100 100 100 100 100 100 Parts by weight (coating layer) 43 43 43 25 25 43 33 33 Coating layer composition (%) Hardened beef tallow 95 94 95 98 90 88 95 93 RNA 5 4 - 2 - 2 5 2 Inosine - - 5 - - - - - Guanine - - - - 10 - - - Capric acid - - - - - 5 - - Lecithin - 2 - - - 5 - 5 Release rate (%) Rumen 10 10 11 20 25 8 8 24 Digestive tract(abomasum+ small intestine) 40 39 35 48 48 47 46 61 Examples 10-16 Feed additive compositions for ruminant animals having the cores, coating compositions and amounts shown in Table 2 were prepared in the same manner as in Example 9, and the results of the evaluation test are shown in Table 2. Comparisons 1-8 The cores, coating compositions and amounts shown in Table 3 were combined in the same manner as in Example 1 to prepare coated granules for comparison. The results of the evaluation test are shown in Table 3. Comparison 1 2 3 4 5 6 7 8 Core A A A A A A B B Parts by weight (core) 100 100 100 100 100 100 100 100 Parts by weight (coating layer) 43 43 43 43 43 25 33 33 Coating layer composition (%) Hardened beef tallow 100 70 99.5 90 95 95 95 90 Capric acid - 30 - - - - - - Caprylic acid - - 0.5 - - - - - Stearic acid - - - 10 - - - 10 Oleic acid - - - - 5 5 - - Palmitic acid - - - - - - 5 - Release rate (%) Rumen 2 87 3 5 4 93 3 5 Digestive tract (abomasum+ small intestine) 1 10 5 8 13 3 7 10 Comparisons 9-12 The cores, coating compositions and amounts shown in Table 4 were combined in the same manner as in Example 9 to prepare coated granules for comparison. The results of the evaluation test are shown in Table 4. Comparison 9 10 11 12 Core A A A B Parts by weight (core) 100 100 100 100 Parts by weight (coating layer) 43 43 43 43 Coating layer composition (%) Hardened beef tallow 100 70 98 100 RNA - 30 - - Inosine - - - - Lecithin - - 2 - Release rate (%) Rumen 1 82 1 3 Digestive tract(abomasum+ small intestine) 3 10 6 2 From the above results, it may be seen that the feed additive composition according to the present invention has excellent effects of protection in the rumen and release in the abomasum and it's sebsequent digestive tract, in comparison to compositions according to the prior art. Effect of the Invention As explained above, a feed additive composition for ruminants has been obtained which combines both excellent stability in the rumen and excellent release in the abomasum and it's subsequent digestive tract compared to the prior art, by coating a core which contains a biologically active substance, with coating composition which contains at least one substance selected from the group comprising one or more substances selected from lower fatty acids and/or nucleic acid-related substances, linear or branched saturated or unsaturated aliphatic monocarboxylic acids of 12-22 carbon atoms or salts thereof, hardened vegetable fats and oils, hardened animal fats and oils and wax. The present invention provides a feed additive containing biologically active substances capable of being efficiently absorbed by ruminants, and therefore it is of major significance from an industrial point of view.

Claims: A feed additive composition for ruminants, comprising a core containing a biologically active substance which core is coated with a coating composition, wherein the coating composition contains at least the following components a) and b): a) at least one substance selected from the group consisting of linear or branched saturated or unsaturated aliphatic nonocarboxylic acids of 12-22 carbon atoms or salts thereof, hardened vegetable fats and oils, hardened animal fats and oils and wax; and b) a substance as defined in i) and/or ii): i) one or more linear or branched saturated or unsaturated aliphatic monocarboxylic acids of 11 carbon atoms or less, and ii) one or more substances selected from the group consisting of nucleic acids, nucleotides, nucleosides, bases composing nucleic acids and salts thereof, wherein the substance b) is contained in said coating composition at a proportion of 1-20% by weight.

Inventors: HEIMA HARUO, NAGAI TAKESHI, NAKAMATSU TSUYOSHI, OZAWA MAKOTO, SATO HIROYUKI, UEDA SATOSHI, HEIMA, HARUO, NAGAI, TAKESHI, NAKAMATSU, TSUYOSHI, OZAWA, MAKOTO, SATO, HIROYUKI, UEDA, SATOSHI, HEIMA, HARUO, C/O CENTRAL RESEARCH LABORATORIES, NAGAI, TAKESHI, C/O CENTRAL RESEARCH LABORATORIES, Nakamatsu, Tsuyoshi, c/o Technology &amp; Eng. Lab., OZAWA, MAKOTO, C/O CENTRAL RESEARCH LABORATORIES, SATO, HIROYUKI, C/O CENTRAL RESEARCH LABORATORIES, UEDA, SATOSHI, C/O CENTRAL RESEARCH LABORATORIES
Applicants: AJINOMOTO KK, AJINOMOTO CO., INC.
Application year: 1993
Main classification: A23K1
IPC codes: A23K1, A61K9