84 



TABLE XXXI. AVERAGE PERCENTAGES OF BUTTER-FAT IN MILK 

 FOR EACH OF 8 WEEKS. 



Out of a possible of 56. 



Average percentage in total daily yield 

 Total butter-fat per day 



Lot I. Lot II. 



3-41 3-08 



4-96 Ib. 5-03 Ib. 



33 per cent, in favour of lot I. Lot II. was only slightly 

 above the standard, viz., 3'08 per cent., which is very low for 

 the whole day's milk. It is with the morning milk, however, 

 that difficulties are usually experienced, and it is a remark- 

 able fact that the morning milk of lot II. in the present 

 experiment was under the standard every day for the eight 

 weeks, while in the case of lot I., it was only nine times under 

 the standard during the same period. The morning milk of 

 lot I. remained practically the same in butter-fat as it was in 

 the preliminary trials, while that of lot II. decreased, on the 

 average, by '35 per cent. The butter-fat in the total daily 

 yield of lot I. decreased, on the average, during the experi- 

 ment, by '16 per cent, as compared with the preliminary 

 trials. In lot II. the decrease was '47 per cent. The milk of 

 lot II. was poorer on the average throughout than that of 

 lot I. This was not entirely due to the food, for it was slightly 



