PROTEIN REQUIREMENTS. 125 
gain or loss in body weight during the three periods under 
review. 
TABLE L.—Giving Net Nutrients to a Pound of Butter Fat, and Daily Yield of 









Products. 
1895-6 1894-5 1901-2 
Protein used daily: (in IbS:)5..2:. 0.06... -2e.. 2.63 2.09 | 1.90 
Proteinstowlilbs Bitter at.....--..--.+<<2- 1.920 1.24.4. 885 
Carbohydrates to 1 lb. Butter Fat..... 5.295 5.395 4.652 
Ether Extract to 1 Ib. Butter Fat....... 570 434 370 
MOLAR ae eae eee cocuak ess wesenSavecesicesce 7.785 7.073 5.907 
BVA OL O fe NAGS ics cccs coccs ccovesesctcetavsccscuese 25.01 26.09 28.40 
VACIOMOLME MiELOhem ate ccttccccccccescncdesseeses te One! 1.069 1.202 
Daily Gain or Lossin Body Weight.... +.20 Sl —.13 




Since no standards have taken butter fat and the quality 
of milk yielded into account, comparisons can only be made 
with results obtained during the three winter’s work under 
review. When the cows had a daily allowance of 2.63 
pounds of protein they returned a pound of butter fat to 
1.92 of net protein; when they received daily 2.09 lbs. they 
returned a pound of butter fat to 1.244 of protein and when 
they received 1.90 they returned a pound of butter fat to 
.885 of protein and that it required 7.785 of net nutrients 
to a pound of butter fat when receiving 2.63 pounds of pro- 
tein, 7.073 when receiving 2.09 and 5.907 when receiving 
1.9 of protein; that is, the greater the protein supply, the 
more nutrients were used to a pound of butter fat yielded. 
From the last sub-division of the table; it is seen that 
the winter the cows received 2.63 of protein they yielded 
daily 25.71 pounds of milk; when receiving 2.09 pounds of 
protein they gave 26.09 pounds and when receiving 1.9 of 
protein they gave 28.40 pounds. But since the milks differed 
in quality the yield is not comparable, but the daily yield in 
butter fat was 1.011, 1.069 and 1.202 respectively; that is, 
the yield of butter fat, as well as milk, was inversely to the 
protein supply. In examining the record as to the gain or 
loss in weight of cows it is shown that the winter they re- 
