266 THE FEEDING OF ANIMALS 



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

 cent carbohydrates. Barley, corn, oats, rye, wheat, 

 cerealine, hominy, oat feeds, corn and oat chop, 

 and corn bran. The fodders and roots properly 

 belong with Class IV. 

 By reference to these groups it is possible to ascer- 

 tain about what place a particular feeding-stuff will 

 take in making up a ration, for instance, to what extent 

 it will serve as a protein amendment to a mixture of 

 materials composed largely of carbohydrates. 



FOODS OF ANIMAL OKIGIN 



360. The principal materials of animal origin that are 

 used in feeding domestic animals are milk, dairy by- 

 products, and offals from slaughter-houses. They 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. 



361. Milk. — ^Whole milk has a greatly varying food 

 value according to its proportion of solid matter. Its 

 composition 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 rela- 

 tion in quantity of the different constituents. 



The table of the average composition of the milk of 

 several species, given herewith, is taken mostly from 

 figures given in Richmond's "Dairy Chemistry:" 



