1911.1 



PUBLIC DOCUMENT — No. 31. 



91 



Composite samples of each cow's milk were secured for five 

 (lays of each week. These composites were averaged, and this 

 average represented the composition of the milk of each cow 

 for the period. The a\erage percentage produced by each cow 

 was nndtipled by the pounds of milk she i)ruduccd, thus secur- 

 ing the weight of total solid matter and fat yield by each ani- 

 mal in the herd. These totals were added and the amount di- 

 vided by the total amount of milk given by the herd, and the 

 quotient represents the average percentage of total solids and 

 of fat, as stated in the table. 



The results indicate that during the low-protein period, the 

 cows produced milk containing .23 per cent, less fat than in the 

 period when the high protein was fed. The difference is not 

 pronounced and may be considered within the limit of a reason- 

 able experimental error. 



Experiment II. ^ 

 This experiment immediately succeeded experiment T. and 

 was conducted with the same cows, excepting that cow IT. (Una) 

 was replaced by Guernsey. The general plan of the experi- 

 ment, methods of caring for the cows, feeding and sampling 

 of milk were all identical with the preceding experiment. 



Bates of the Experiment. 



It will be seen that each period lasted twenty-one days, with 

 a ]U'oliniinary feeding of seven or more days. 



Averarje Daih/ Bntions fed to the Six Coivs {Pounds). 



' Ninth annual report of the Hatch Experiment Station, pp. 100-125. 



