lUll.l 



PUBLIC DOCUMENT — No. 31. 



101 



Samples of milk from each cow were taken weekly for five 

 fonseciitive days, aud tested for total solids and for fat. The 

 average percentage prodnced by each cow for the nine weeks 

 was mnltiplied by the amonnt of milk prodnced during the 

 same period, and the amounts of total solids and of fat pro- 

 duced by the entire herd on each of the two rations calculated. 

 These amounts, divided by the total milk yield, gave the aver- 

 age percentages of total solids and fat produced by each herd 

 for the entire period. 



The product of each milking of the six cows receiving the 

 two different rations was also mixed, and composite five-day 

 samples tested for total solids, fat, nitrogen and ash. In case 

 of total solids and fat the average results varied less than .1 

 ])er cent, from those secured by the other method. The average 

 results stated in the table above represent those secured by the 

 last-described method. 



It will be seen that the two rations produced milk of sub- 

 stantially the same composition. While the excess of protein 

 appeared to have noticeably influenced the amount of the milk 

 produced, it was without influence on its composition. 



Experiment V. — 189S. 

 This experiment was conducted on the same plan as experi- 

 ment IV., and the conditions were substantially the sauie. 

 Nine cows only were used, being divided into herds of five and 

 four. 



Dates of the Experiment. 



First Half. 



Nine days elapsed between halves, and the halves themselves 

 lasted twentv-six days each. The " cow balance " was hardly 



