1911,] 



PUBLIC DOCUMENT — No. 31. 



101 



Samples of milk from oaeli eow were taken weekly for five 

 consecutive clays, and 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 dnring the 

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

 dnced by the entire herd on each of the two rations calcnlated. 

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

 age percentages of 1otal solids and fat pi'odnccd by each herd 

 for the entire period. 



The product of each milking of the six cows receiving the 

 Iwo 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 resnlts varied less than .1 

 })er cent, from those seenred l)y the other method. The average 

 resnlts stated in the table al)ove represent those secnred by the 

 last-described method. 



It will be seen that the two rations prodnced milk of snb- 

 stantially the same composition. While the excess of protein 

 appeared to have noticeably inflnenced the amonnt of the milk 

 prodnced, it was withont inflnence on its composition. 



Experiment T. — 1S98. 

 This experiment was condncted on the same plan as experi- 

 ment IV., and the conditions were snbstantially the same. 

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

 fonr. 



Dates of the Experiment. 



First Half. 



Nine days elapsed between halves, and the halves themselves 

 la^^ted twenty-six days each. The " cow balance " was hardly 



