PEED FOR THE COW 145 



It is customary to say that one pound of ether 

 extract has from 2.2 to 2.5 times the heat energy 

 of a pound of carbohydrates. 



How rations are compounded. In compound- 

 ing a ration we first estimate the amount of dry 

 matter in the feed; that is, the amount that the 

 feed would weigh if all the water it contained 

 were driven off by heat. Similarly it is neces- 

 sary to estimate the amounts of protein, carbo- 

 hydrates and ether extract. There are several 

 things, however, that must be taken into con- 

 sideration. A considerable portion of the pro- 

 tein is not digestible and therefore the animal 

 may be charged with receiving protein which 

 she cannot use, as a comparison of the following 

 tables will show. 



(From Henry's "Feeds and Feeding"): 



TABLE I 



Water and total nutrients per 100 pounds feed 



Crude Nitrogen Ether 



Feeding Stuffs Water Protein Fiber Free Extract 



Roughage: Lbs. Lbs. Lbs. Extract Lbs. 



Corn stover, field cured. 40.5 3.8 19.7 31.5 1.1 



Red clover hay 15.3 12.3 24.8 38.1 3.3 



Timothy hay 13.2 5.9 29.0 45.0 2.5 



Oat straw 9.2 4.0 37.0 42.4 2.3 



Concentrates: 



Corn, dent 10.6 10.3 2.2 70.4 5.0 



Oats 110 11.8 9.5 59.7 5.0 



Wheat bran ■ 11.9 15.4 9.0 53.9 4.0 



Linseed meal, 0. P 9.2 32.9 8.9 35.4 7.9 



