87 



TABLE XXXIV. AVERAGE QUANTITY OF MILK IN PINTS PER 

 LOT PER DAY FOR 8 WEEKS. 



After reversing the rations, the greater yield is given by 

 lot I., which, if the increased flow of milk in the previous 

 experiment was due to the brewers' grains, is precisely what 

 should have happened. There is not the same difference 

 between the two lots on the average as there was in Experi- 

 ment I., but making certain allowance for the advance in the 

 lactation period, the effect of the brewers' grains on lot I. in 

 the present experiment is almost as striking as it was on lot 

 II. in the previous one. Taking the two experiments together, 

 there can be no reasonable doubt as to the effect of brewers' 

 grains in materially increasing the flow of milk, and that their 

 effect continues over a considerable period of time. Previous 

 experiments have shown that a. change of food may, at any 

 time, cause a temporary increase in the milk yield, but the 

 increase is maintained in this case to the end of the experi- 

 ment. The drop in the yield of lot II. after the change, when 

 they no longer received any brewers' grains, was even more 

 remarkable than the increase in the yield of lot I., after the 

 change. In the first week of the experiment, there was a drop 

 on the average of 16 pints per day in lot II., and the milk 

 continued to decrease, although not regularly, till nearly the 

 end of the experiment. In the last week of all there was an 

 increase in the yield of both lots, which is impossible to explain. 



