New York Agricultural Experiment Station. 



497 



The following is a statement of the composition of these foods 

 before and after extraction. It is seen that the amount of fat left 

 in the treated materials was so small that it was possible to feed 

 the animal a fairly generous ration that contained not over thir- 

 teen hundredths of a pound of petroleum ether extract daily, prob- 

 ably not all of which was pure fat or oil. In order to control the 

 protein supply in the ration, use was made of wheat gluten, which 

 contained, as the analyses show, from seventy-two to seven ty- 

 four per cent of protein. 



Composition of Foods. 



♦With hay and corn meal, proteln=Nx6.25; with oats, protein=NX6; with wheat gluten, 

 protein=NX5.7. 



The Animal. 



The animal selected for use in this experiment was a young 

 grade Jersey cow of a vigorous type. When the experiment was 

 begun, she was somewhat thin in flesh and about four months 

 advanced in the period of lactation. The vigorous appetite which 



