68 



the second six weeks, on double the quantity of concentrated 

 iood, it was about 113 pints, a drop of about 15 pints per day. 

 The drop in lot II. for the same two periods was only about 

 4J pints more, although this lot received no extra food what- 

 ever. It is obvious that the increase in the cake and meal 

 given to lot I. did not prevent the average yield going down 

 during the second, as compared with the first, six weeks, and 



TABLE XXIII. AVERAGE PERCENTAGE OF BUTTER-FAT IN MILK 



FOR 12 WEEKS. 



Average percentage in total daily yield, 1 st period . . . 

 ,, ,, 2nd period ... 



* Out of a possible of 84. 



Lot I. 

 3-52 

 3-51 



Lot II. 

 3-58 

 3-56 



the cows would probably have done just as well without it. 

 Allowance must be made, of course, for the advance in the 

 lactation period, which affected both lots alike. The effect 

 generally of increasing the food is what might have been 

 .anticipated in the light of previous experiments. (See Offerton 

 Bulletin I., Experiments B, C, and D), 



