110 EXPEEIMENT STATION. [Jan. 



5. The substitution of Unseed meal with a minimum per- 

 centage of oil (3 per cent.) in place of the cotton-seed meal 

 and cotton-seed oil resulted in a decline of the fat in the milk 

 to its normal percentage. This change probal)ly was due to 

 the removal of the cotton-seed oil from the ration, and not to 

 the influence of the linseed meal. 



6. The addition of .6 of a pound of corn oil to a ration made 

 up of a mixture of grains low in fat increased the fat percent- 

 age of the milk .23 per cent. (5.17 to 5.40). At the end of 

 two weeks the eff'ect of the corn oil had disappeared, and the 

 milk had returned to its normal fat content. 



7. The sudden removal of the corn oil from the daily ration 

 caused a drop of .54 per cent, in the fat (4.97 to 4.43), but 

 after the first week the normal fat per cent, was again present. 



8. Corn oil appeared to have depressed the nitrogen per- 

 centage of the milk by .034 per cent. (.610 to .576), the 

 nitrogen gradually returned to its normal percentage after the 

 feedino- of the corn oil had ceased. 



9. Corn meal (a carbohydrate feed) was without efi'ect on 

 the composition of the milk. 



10. Tavo to 3 pounds of soy hean meal with a minimum oil 

 percentage (8 per cent.), fed daily to each animal, did not 

 appear to in any way modify the proportions of the several 

 milk constituents. 



11. The addition of 1/^ to 1 pound dail}^ of soy bean oil to a 

 basal ration of grain and hay very slightly increased the fat 

 percentage in the milk during the first two or tlu-ee weeks 

 (.10 per cent.). No other variation was noted. 



12. The sudden removal of the soy bean oil from the ration 

 caused a drop of .25 percent, of the fat percentage of the milk. 

 At the end of three weeks the milk had not regained its normal 

 fat percentage. 



(Ij) Effect on Butter Fat. 



13. Corn gluten and linseed meals with a minimum percent- 

 age of oil (3 per cent.) produced a normal butter fat. Cotton- 

 seed and soy bean meals with a minimum oil percentage (8 per 

 cent.) likewise effected little change in the composition of the 

 butter fat. Corn meal was without noticeable influence on the 

 composition of the butter fat. 



14. Linseed oil (1.4 pounds digestible oil per head daily) 



