268 Agricultural Experiment Station, Ithaca, N. Y. 



*' That the results of feediag oils tend to couiirm the conclusions 

 that the composition of a cow's milk is determined by the individu- 

 ality of the cow, and that although an unusual food maj disturb for 

 a time the composition of the milk, its effect is not continuous." 



Jiiretschke has found* as a result of the addition of four to five 

 pounds per thousand pounds live weight, of cotton seed cake, rape 

 cake, and peanut cake to a basal ration consisting of hay, straw, 

 brewers' grains and wheat bran, that the "milk secretion is not 

 directly, but only indirectly, affected by the feeding, and that the 

 feeding of large amounts of fat does not increase the amount of 

 butter fat in the milk." 



Spier f concludes as follows, as the result of feeding cows on 

 pasturage, brewers' grains and potatoes with bean meal, cotton-seed 

 cake, barley meal and linseed cake, that " although the quantity of 

 milk is easily influenced up to a certain point by the food supply, 

 the quality is not materially altered by any ordinary mixed food. 



" The proportion of butter fat is very little influenced by foods 

 containing a large percentage of oil, such as linseed or cotton cake, 

 nor yet by albuminous food, such as bean or pea meal, decorticated 

 cotton cake, etc." 



On the other hand, some experiments made by Mr. Henry Yan 

 Dreser, of Cobleskill, N. Y., and reported in Hoard's Dairyman, 

 Vol. XXV, No. 18, p. 288, June 22, 1894, have shown a remarkable 

 increase in the yield of fat by the addition of tallow to the ordinary 

 ration. 



In brief, Mr. Van Dreser's methods and results were as follows : 



The cows, thoroughbred Holsteins, had been receiving a ration of 

 thirty pounds of ensilage per day with hay at noon, with a grain 

 ration of six pounds of a mixture of two parts of wheat bran, and 

 one part each of cotton-seed meal and corn meal. The skim milk 

 was also fed back to the cows. At the beginning, one-quarter of 

 a pound per cow per day of clean beef tallow was shaved up and 

 mixed with the grain ration. The cows ate the tallow readily, 

 and in the course of two weeks the amount was increased to two 

 pounds per day. At the end of five weeks, a week's butter test was 

 made of each cow, the results being as follows : 



*Molkerei Seitung, Vol. VII, 38, p. 518. 



t Transactions of Highland and Agricultural Society of Scotland, 1894, p. 83 



