Definition:

"1*<. /..-270 2< * 7>=;2=287*5 6*7*0.6.7=

<=;*=.0B 27 @12,1 =1. 270;.-2.7= *7-

,1.62,*5 ,8698<2=287 8/ =1. -2.= 2< 68-2/2.-

8?.; =26. <8 =1*= =1. 7>=;2.7= ,8698<2=287 8/

=1. -2.= 68;. ,58<.5B 6..=< =1. 7>=;2.7=

;.:>2;.6.7=< 8/ =1. *726*5

Purpose:

&1. 9>;98<. 8/ 91*<. /..-270 2< =8

-.,;.*<. .A,.<< 7>=;2.7=< 27 =1. -2.= 27 8;-.;

=8 -.,;.*<. 7>=;2.7= .A,;.=287 *7-

<>+<.:>.7= 58<<.< 8/ =1.<. 7>=;2.7=< =8

0;8>7- @*=.; <>;/*,. @*=.;< 8; =1.

*=68<91.;. =8 269;8?. 7>=;2=287*5

.//2,2.7,B *7- =8 58@.; /..- ,8<=<

How Does This Practice Work:

< +../ ,*==5. 0;8@ *7- 6*=>;. 6*7B 8/

=1.2; 7>=;2.7= ;.:>2;.6.7=< 68<= 78=*+5B

9;8=.27 -.,;.*<. !$ 	 &12< 2< *5<8

=;>. 8/ 5*,=*=270 ,8@< *< =1.B 9;80;.<<

=1;8>01 =1. 5*,=*=287 9.;28- &B92,*55B

/..-58= -2.=< *;. /.- =8 6..= =1. *726*5D<

7>=;2.7= ;.:>2;.6.7=< .*;5B 27 =1. /..-270

9.;28- @1.7 =1.B =.7- =8 +. =1. 1201.<=

+.,*><. 5.*7 =2<<>. *,,;.=287 2< 0;.*=.<=

(*<,87,.58< *7- *5B.*7 	 / =1.

<*6. -2.= 2< /.- =1;8>018>= =1. /..-270

9.;28- 5*=. 27 =1. /..-270 9.;28- @1.7 5.*7

=2<<>. *,,;.=287 <58@< *7- *-298<. =2<<>.

*,,;.=287 27,;.*<.< =1. :>*7=2=B *7-

,87,.7=;*=287 8/ 9;8=.27 27 =1. -2.= 6*B +.

.A,.<<2?. 5.*-270 =8 27,;.*<.- 58<<.< 8/

72=;80.7 27 =1. >;27. &1. 6*38; <8>;,. 8/

*66872* /;86 /..-58= 9.7< 2< >;.* /;86

>;27. &1>< 2/ =1. :>*7=2=B 8/ >;.* .A,;.=.-

,*7 +. -.,;.*<.- *66872* .62<<287< @255

*5<8 +. -.,;.*<.- 85. .= *5 	 &8-- .=

*5 	


Where This Practice Applies and

Its Limitations:

"1*<. /..-270 ,*7 +. ><.- 27 <6*55 8;

5*;0. ,*==5. /..-58=< 8@.?.; =1.;. *;. *

7>6+.; 8/ 5262=*=287< ";*,=2,*55B /..-6255<

*= 68<= /..-58=< *;. 5262=.- 27 =1. 7>6+.; 8/

;*=287< =1.B ,*7 6*4. *7- 6*7*0. .*,1 -*B

5<8 6*7*0270 =1. -.52?.;B 8/ ;*=287< =8

,*==5. 27 * =26.5B *7- ,87<2<=.7= 6*77.; ,*7

+. 68;. -2//2,>5= *< =1. 7>6+.; 8/ ;*=287<

27,;.*<.<

2<=8;2,*55B <>995.6.7=*5 9;8=.27 @*<

=1. 68<= .A9.7<2?. 7>=;2.7= 27 * /..-58= -2.=

&8-*B 6*7B /..-58= -2.=< ,87=*27270 1201

9;8=.27 +B9;8->,= /..-< <>,1 *< -2<=255.;D<

0;*27< 8; ,8;7 05>=.7 /..- @12,1 *;. +B

9;8->,=< 8/ .=1*785 9;8->,=287 *7- =1. ,8;7

<=*;,1 27-><=;B ;.<9.,=2?.5B &1.<. -2.=<

6*B ,87=*27 ,87,.7=;*=287< 8/ 9;8=.27 =1*=

*;. 27 .A,.<< 8/ *726*5 ;.:>2;.6.7=<

8@.?.; =1.;. *;. <>+<=*7=2*5 .,87862,

+.7./2=< =8 /..-270 =1.<. ,89;8->,=< *7-

=1.B *;. * 1201 :>*52=B <8>;,. 8/ /2+.; *7-

.7.;0B 87<.:>.7=5B =1. .A,.<< 9;8=.27 27

6*7B /..-58= -2.=< 2< 78= * 7.0*=2?.

.,87862, /*,=8; *< 2= @*< 27 =1. 9*<= =1>< 2=

-8.< 78= 3><=2/B *-3><=270 =1. ;*=287 =8 5262=

9;8=.27 ,87=.7=

7 ;.,.7= B.*;< <.?.;*5 7.@ 98=.7= 0;8@=1

9;868=270 /..- *--2=2?.< =.;6.- +.=*

*0872<=< 1*?. +.,86. *?*25*+5. =8 ,*==5.

/..-.;< .=**0872<=< <1*;. <86.

91*;6*,85802,*5 9;89.;=2.< @2=1 .927.91;27.

*7- 9;868=. 0;8@=1 +B *,,.5.;*=270 6><,5.

=2<<>. *,,;.=287 *7- -.,;.*<270 /*=

-.98<2=287 &1.<. 9;8->,=< *;. /.- =1. 5*<=

	 =8 
 -*B< 8/ =1.  	 8; <8 -*B< +../

,*==5. *;. =B92,*55B 27 =1. /..-58= .,*><.

=1. -2.= 6><= +. 68-2/2.- =8 /..- * +.=*

*0872<= =12< 2< * 98<<2+5. 8998;=>72=B =8 *5<8

,1*70. =1. 9;8=.27 ,87,.7=;*=287 27 =1. -2.=

2/ 2= ,*7 +. ,5.*;5B 3><=2/2.- /8; .,87862, 8;

.7?2;876.7=*5 ;.*<87< .,*><. 8/ * 5*,4 8/

,87=;855.- <=>-2.< *= =1. 9;.<.7= =26. 2= 2<

78= ,5.*; 2/ =1. 9;8=.27 ;.:>2;.6.7=< 8/ ,*==5.

*;. 27,;.*<.- @1.7 =1.B *;. /.- +.=*

*0872<=< &1>< 2= 2< 78= ,5.*; 2/ 91*<.

/..-270 8/ 9;8=.27 @255 @8;4 <>,,.<</>55B 27

,*==5. /.- * +.=**0872<=

Phase Feeding Crude Protein to

Decrease Ammonia Emissions from

Finishing Beef Cattle

>=18;< .6*25

*7-B,85.*;<><-*08?

Developed by:

Livestock GRACEnet

leading the development

of mitigation practices to

reduce emissions from

livestock production

For more information

visit us at

www.ars.usda.gov/

livestockGRACEnet

USDA is an equal

opportunity provider and

employer
Effectiveness:

$.<.*;,1 <=>-2.< 27 &.A*< *7- !.+;*<4* 1*?. 78=.-

*   =8 	 -.,;.*<. 27 72=;80.7 27=*4. 72=;80.7

.A,;.=287 *7- ?85*=25. 72=;80.7 58<<.< /;86 /..-58=<

@1.7 ,*==5. @.;. 91*<. /.- 9;8=.27 27 =1.2; -2.=

&B92,*55B 27 =1.<. <=>-2.< 272=2*5 -2.=< ,87=*27.-  
 =8

 
 ,;>-. 9;8=.27 *7- ,*==5. @.;. /.- /8;  	 =8  

-*B< 2.=< /.- ->;270 =1. 5*<= 	 =8 
 -*B< ,87=*27.-

 =8  ,;>-. 9;8=.27 )1.7 -2.=< @.;. +*<.- 87 -;B

;855.- ,8;7 =1.;. @*< 78 *-?.;<. .//.,= 87 *726*5

9.;/8;6*7,. +>= ! .A,;.=287 @*< -.,;.*<.-  	 =8 	

*7- ! ?85*=252C*=287 58<<.< @.;. -.,;.*<.-   =8 



 =8   5+1.*- ;2,4<87 *7- 589/.7<=.27 	 

)1.7 -2.=< @.;. +*<.- 87 <=.*6/5*4.- ,8;7 .//.,=<

87 *726*5 9.;/8;6*7,. @.;. 5.<< ,87<2<=.7=

(*<,87,.58< .= *5  	
 85. .= *5 	
 +>= 91*<.

/..-270 -.,;.*<.- .<=26*=.- ! .A,;.=287 +B 
 =8 

5+<=..; *7- 72=;80.7 ?85*=252C*=287 58<<.< +B 
 =8 

5+<=..; 85. .= *5 	


Cost of Establishing and Putting

Practice in Place:

&1. -2;.,= ,8<=< 8/ 91*<. /..-270 *;. 12015B

-.9.7-.7= >987 =1. ,8<=< 8/ /..- 270;.-2.7=< 0;8@=1

;*=. 8/ =1. ,*==5. 272=2*5 *7- /27*5 @.201=< *7- 0.7.=2,

*+252=B =8 .//2,2.7=5B >=252C. 7>=;2.7=< 27 =1. -2.=

7-2;.,= ,8<=< <>,1 *< ,1*70.< 27 /..- 6255 8; /..-

=;>,4 6*7*0.6.7= @255 ?*;B @2=1 />.5 *7- 5*+8; ,8<=<

References:

85. !  $ ! 5*;4 $ ) &8--  $

$2,1*;-<87  >.B.  ) ;..7. *7-  ,;2-.

	 7/5>.7,. 8/ -2.=*;B ,;>-. 9;8=.27 ,87,.7=;*=287

*7- <8>;,. 87 98=.7=2*5 *66872* .62<<287< /;86 +../

,*==5. 6*7>;.  726 %,2 
		


85. !  "  ./88;   *5B.*7   >//

*7-   5.018;7 	
 //.,=< 8/ 91*<./..-270 8/

,;>-. 9;8=.27 87 9.;/8;6*7,. ,*;,*<< ,1*;*,=.;2<=2,<

<.;>6 >;.* 72=;80.7 ,87,.7=;*=287< *7- 6*7>;.

72=;80.7 8/ /272<1270 +../ <=..;<  726 %,2


	

	

;2,4<87  *7- & 589/.7<=.27 	  !>=;2=287*5

*7- 6*7*0.6.7= 6.=18-< =8 -.,;.*<. 72=;80.7 58<<.<

/;86 +../ /..-58=<  726 %,2  %>995 	

 

!$ 	 !>=;2.7= $.:>2;.6.7=< 8/../*==5.

'9-*=. 	 =1 .- !*=5 ,*- ";.<< )*<1270=87



&8-- $ ) !  85. *7- $ !5*;4 	


$.->,270 ,;>-. 9;8=.27 27 +../ ,*==5. -2.= ;.->,.<

*66872* .62<<287< /;86 *;=2/2,2*5 /..-B*;- <>;/*,.<

 7?2;87 #>*5


(*<,87,.58<  & *7-   *5B.*7 	

!>=;2=287*5 ;.,866.7-*=287< 8/ /..-58= ,87<>5=270

7>=;2=2872<=< &1. 	 &.A*< &.,1 '72?.;<2=B <>;?.B

 726 %,2 			

(*<,87,.58<  &  ) ;..7. !  85.  %

;8@7  & ,855>6 *7-  &.-.<,12 	


//.,=< 8/ 91*<. /..-270 8/ 9;8=.27 87 9.;/8;6*7,.

+588- >;.* 72=;80.7 ,87,.7=;*=287 6*7>;. !" ;*=28

*7- ,*;,*<< ,1*;*,=.;2<=2,< 8/ /..-58= ,*==5.  726

%,2  

	



For Further Information:

87=*,= 7-B 85. $.<.*;,1 726*5 %,2.7=2<= *7-

$.<.*;,1 .*-.; *= *7-B,85.*;<><-*08?

This practice falls under the NRCS

Conservation Practice Standard 592

(Feed Management)