75 



TABLE XXVII. AVERAGE PERCENTAGE OF BUTTER-FAT IN 

 MILK FOR 10 WEEKS. 



Average percentage in total daily yield, 1st period 

 2nd period 



* Out of a possible of 70. 



Lot I. Lot II. 



3-37 3-43 

 3-39 3-52 



must not, therefore, be attributed to the increased allowance 

 of concentrated food given to this lot in the second period. 

 It was probably due to the advance in the lactation period. 

 A somewhat curious point will be observed in this connection 

 in the present experiment. Lot I. gave, on the average, 

 during the whole period of the experiment, considerably 

 poorer milk than in the preliminary trials, if we look at the 

 percentage of fat in the total daily yield of milk. This is 

 rather difficult to explain. Lot II. also fell slightly below 

 the preliminary trials in the first half of the experiment, but 

 not so much as did lot I., whilst in the second half, the butter- 

 fat in this lot was higher than in the preliminary trials, which 

 might have been expected. But these details apart, the 



