29 



by means of a Grerber Acid-Butyrometer, and the 

 fat " calculated from the usual formula. 



solids not 



FIKST SERIES OF EXPERIMENTS. 

 Preliminary trials To secure cows which were fairly 

 regular in the yield and quality of their milk, a preliminary 

 test extending over three weeks was made. Sixteen short- 

 horn cows of the usual type in the North of England, all 

 having calved between the end of September and the end 

 of October, were selected from the herd, and each cow was 

 tested for yield of milk and percentage of butter-fat once 

 a week. At the end of this period, ten of the most " regular " 

 cows from this number were finally selected. The average 

 quantity of milk and other particulars relating to these ten 

 cows are given in Table I. In all the feeding experiments 

 described in this Report, the cows were milked at 5 a.m., 

 12'30 p.m., and 6 p.m. 



TABLE I. YIELD OF MILK AND PERCENTAGE OF BUTTER-FAT 

 IN PRELIMINARY TRIALS. 



