
PROTEIN REQUIRED FOR DAIRY COWS. 167 
TABLE 80. 
Liffect of Change in Protein. 
A. Protein below 1.50 pounds in original ration and increased more than 0.4 
pound; average increase, 0.69. 
B. Protein above 1.50 pounds in original ration and increased more than 0.3 
pound; average increase, 0.68. 
C. Protein increased less than 0.24; average increase, 0.17. 













. fI rs ) : u a3 
Se gee Hohn ak tenes op “ Be Rohe 
° ° U u Aw soe |S 3 oy | 2 
O 2 o O @ | po A a Coe Cw 
NO.OF TEST. tig.) > 5 *e woh a8 besa a Bue ast 
° a =“ ° 3 ° ° re) vu oS 
Hee 2 ae et 2 la | eles 
A a A = ZS 
: S oy Hy | By ga 
A. 
Oanai= Pes ied O25. 050) 7223) 14.4)>-9.0/T5 2.67) sd2rh 16,37). 379 
1G ns - |87| 2.09] 25,460} 8.60) 14.1 SO\TO. 70) 0241.17.03 4.3 
Difference, +.69| +410)+1.37) —.3/—8.1/+.83|+ .103|+1.26|+ .4 
je. 
Cpe pale - |96| 2.04] 29,103) 8.94] 13.2] 13.5|18.98) 1.065) 20.24] 4.5 
ee], 2- =) LOO 2.72). 28,350| 9.80| 11.6) 11.9/18.84) 1.1160) 20.54) 5-3 
Difference, +.68) —753| +.86|/—1.6|—1.6/—.14/+.051| +.30/+.8 
C; 
Oe eee 104 12, 10). 30,570), 9.30]. 16.6) -5.7/10.91)  .975 21,.07)04.0 
ey ae - |94| 2.27| 27,700] 9.04] 14.1) 6.3|/16.98) .998) 19.45) 5.1 
Difference, + .17/—2,870| —.26|—2.5) +.6/+.07|+ .023|—2.22)+ .2 










3. Lffect of protein on milk flow.—An 800-pound cow needs 
for maintenance about 0.56 pound of protein per day, and when 
yielding 18 pounds of five per cent. milk, about 0.7 pound to 
| replace the protein withdrawn in the form of casein and albumen. 
In addition, a certain amount of protein is consumed by the 
animal organism in the process of milk formation. An additional 
amount may be a stimulant to milk production. The amount 
of protein as well as other nutrients needed by the cow has been 
determined by experiments—with variable results—and ex- 
pressed in feeding standards. 
The Wolff standard allotted 2.5 pounds of protein to a cow 
weighing 1,000 pounds and giving an average quantity of milk, 
as did also the Atwater and Phelps proposed standard. The 
Wolff-Lehman standard, however, called for 2.5 pounds of 
