G6 AGRICULTURAL EXPERIMENT STATION. [Jan. 



The above table j^resents the average results obtained 

 from the six cows in each of the three series. The average 

 weight of the herd remained quite constant during the four 

 months' trial, showing a slight decrease in Series I. b, when 

 a small amount of protein was fed, and another slight de- 

 crease in Series III. h, when a very large amount of protein 

 was consumed. The total amount of organic matter fed in 

 each series is practically the same, and, so far as the total 

 digestible nutrients are concerned, the animals can be said 

 to have been well nourished. 



Series I. a and h. 



The table shows that, with the same amount of total 

 organic matter consumed daily, only one-half the digestible 

 protein (1.50 pounds) was fed in ration h that was con- 

 sumed in ration a. 



The milk production in h decreased 12. GO per cent, on 

 the basis of 13 per cent, solid matter, the total solid matter 

 12.52 per cent, and the total fat 21.49 per cent. The per- 

 centage decrease in the composition of the milk in b was in 

 case of the total solids but 1.71 per cent., while in case of 

 fat it was 8.52 per cent, with milk containing 13 per cent, 

 solids. In this Series a the average results show the solids 

 not fat were decreased only 4.10 per cent. Attention has 

 already been called to the fact that some cows in this series 

 showed a percentage decrease in the percentage of solids 

 not fat of from 5 to 7 per cent. 



The figures would seem to indicate that the lack of protein 

 caused a decrease in the total milk yield, and also a de- 

 crease, although not so much, in the composition of the 

 milk itself, especially in the fat content. 



Series II. a and b. 

 The same is true of this series as of the former one. The 

 variation in the protein supply is not so great, the difference 

 being in the substitution of 3 pounds of corn meal for 

 3 pounds of Bullalo gluten feed. Ration a, when more 

 protein was fed, produced 5.92 per cent, more milk w^ith 

 13 per cent, solids and 5.78 per cent, more solid matter. 

 The amount of fat increased 11.58 per cent, with ration a. 



