1895.] PUBLIC DOCUMENT — No. 33. 67 



A percentage increase of 1.23 per cent, in the per cent, of 



total solida was noted, and a percentage increase of 5.35 



per cent, in the per cent, of total fat on the basis of 13 per 



cent, solids. 



It is quite possible that the high percentage of fat in the 



Buffah) gluten feed might have been instrumental in causing 



part, at least, of the increase in the fat percentage of the 



milk. 



Series III. a and b. 



In this series the amount of protein fed was very high. 

 The maximum increase in the fat percentage in the milk 

 appears to have been reached, for 4.32 pounds of protein 

 did not seem to cause any increase in either the total solids 

 or fat of the milk. Neither is any increase in the fat per- 

 centage to be noted in this period above the other periods, 

 when 3 pounds of digestible protein were fed, being an 

 indication at least that, other things being equal, more than 

 3 pounds of digestible protein daily ceases to exert any 

 influence on the increase of fat in the milk.* 



The increase in the protein supply, however, caused 

 apparently 11.10 per cent, increase in the total yield of 

 milk. 



Concluding Observations. 



This experiment has some weak points, but it is believed 

 they are not of such a serious nature as to interfere with its 

 general teaching. 



For example, the temperature of the stable was not a con- 

 stant one, not being artificially heated. Again, the cows 

 were divided into two lots, and one lot produced rather 

 more milk daily than the other, but the difference was not 

 excessive. 



The milk should have been sampled for four or five days 

 at least in every seven, instead of l)ut for three days. 



In the hist series different coarse fodders were used from 

 those fed in the two previous ones. The last series was of 

 too short duration, and the first two series might have been 



* In this series cow Hattie was snlistitnteil for Sarah. This cow gave milk of 

 essentially the same fat content as did Sarah ; still, it is not strictly fair to compare 

 one series with another, for this reason. 



