4O FEEDING FARM ANIMALS 



that the protein increase is very similar in the three 

 classes, and that the fat increase ranges between 

 eight and nine times the quantity of the protein. 



Group Constituents. The substances of the ani- 

 mal's body may be grouped under four heads : 



1. Water. 



2. Ash or mineral matter. 



3. Protein. 



4. Fat. 



WHAT AN ANIMAL CONTAINS 



Protein, the dark red substance; fat, the white strips; bone or mineral 

 matter; and water, comprise the distinct groups of substances that form the 

 animal body. 



This grouping differs little from that of plants. 

 Since starch, the vegetable gums, sugar, cellulose, 

 etc., are derived from the same elements and have 

 the same fuel value when assimilated by the animal, 

 they can be classed as carbohydrates. The carbo- 



