100 



EXrEULMENT STATION, 



[Jan. 



Influence uf Protein on Milk Yield. 



Herd Itesults in Pouuds. 



The average amount of digestible protein fed daily per cow 

 in the high-protein ration — 2.10 pounds — could not be con- 

 sidered excessive, although it was 48.6 per cent, more than was 

 rc(iuired for milk and maintenance. The average amount of 

 digestible protein fed daily per cow in the low-protein ration 

 was 1.G7 pounds, which was 21.4 per cent, above that neces- 

 sary for milk and maintenance. The high-protein ration, 

 being 48.6 per cent, in excess of the protein minimum, pro- 

 duced 5.9 per cent, more milk than did a ration made up of 

 similar feedstuff s which was 21.4 per cent, in excess of the 

 minimum. Such a difl'erence in an experiment extending o\'er 

 a i)eriod of sixty-three days is believed to be too pronounced to 

 be attributed to an experimental error, and is evidently the 

 result of the increased amount of protein fed. In this con- 

 nection it may be remarked that if the practical feeder pur- 

 chased all of his grain, it would be to his advantage to buy 

 gluten feed rather than corn meal. If he produces his own 

 corn, the feeding of one-third bran, one-half corn and cob meal 

 and one-sixth gluten feed would be advisable. 



