94 



EXrEULMKXT STATION, 



[Jan. 



Composition of the Herd 3Iilk {Per Cent.). 



The samples were taken and averages secured in the same 

 way as in the previous experiment. Here we have a direct 

 reversal of the results, the low-protein ration showing a trifle 

 higher average fat percentage than the high-protein ration. 

 This may also be regarded as within the limit of error. The 

 percentage of nitrogen in the milk produced during each half 

 of the experiment is substantially the same, and this in sjiite of 

 ihv fact that ihe low-protein ration contained but 1.45 pounds 

 of digestible protein, and the high-protein ration 2.85 pounds. 



Ex'pcr 'uncut 1 11.^ 

 This experiment was one of a series designed to study the 

 effect of food stuH's ujxm the composition of milk and of butter 

 fat. Only that ])()rti()n of the exjieriment is here published 

 which shows the influence of protein upon the yield and com- 

 position of the milk. It was planned on the group system, 

 five cows composing each group. The first two ])t'riods of the 

 experiment only are needed in this connection. 



Duration of Experiment. 



' See r6sum6 in fourteenth report of the Hatch Experiment Station, pp. 162-168. 



