252 The Feeding of Animals 



Class IV. Eight to 14 per cent protein, 75 to 85 

 per cent carbohj^drates. Barley, corn, oats, rye, 

 wheat, cerealine, hominy, oat feeds, corn and 

 oat chop, and corn bran. The hays and other 

 fodders properly belong with Class IV. 



By reference to these gronps it is possible to ascer- 

 tain about what place a particular feeding stuff will 

 take in making up a ration, for instance, to what ex- 

 tent it will serve as a protein amendment to a mixture 

 of materials composed largely of carbohydrates. 



FOODS OF ANIMAL ORIGIN 



The principal materials of animal origin that are 

 used in feeding domestic animals are milk, dairj- by- 

 products and offals from slaughter-houses. The3^ are 

 mostly characterized by their large relative proportion 

 of protein and their high rate of digestibility. The 

 net nutritive value of their solid matter is very high, 

 because it is practically all utilized and a minimum 

 amount of energy is required for its mastication and 

 digestion. Practice has long recognized the peculiar 

 efficiency of feeding stuffs of this class, which is due 

 to the directly available forms of the nutrients. 



Milk. — Whole milk has a greatly varying food value 

 according to its proportion of solid matter. Its com- 

 position is determined by several factors. The milks 

 of different species of domestic animals are greatly 

 unlike both in their proportions of total solids and in 

 the relation in quantity of the different constituents. 



The table of composition of the milk of several 



