FEED NUTRIENTS IN THE ANIMAL BODY 



8< 



hay, it may be necessary to add a nitrogenous concentrate, as 

 linseed oil meal or bran, to supply the deficient amino acids. 

 Wheat gliadin, the protein which makes up about half the 

 crude protein of wheat, is deficient in lysine, an amino 

 acid which is essential to growth. Thus in experiments by 

 Hart and McCollum at the Wisconsin Station,^ wheat and 

 mineral matter cUd not produce maximum growth in pigs, 



Fig. liU. — Tlie same piji.s as shown in Figure 19 after 196 days of feeding corn 

 alone. Average weight, 64 pounds. (Kentucky Experiment Station.) 



while the addition of a small amount of casein (which con- 

 tains all the essential amino acids) caused normal growth. 

 Gliadin from rye and the protein, hordein, from barley also 

 will not produce maximum growth. 



Functions of Carbohydrates. — The functions of the car- 

 bohydrates of the feed, i.e. the starches, sugars, celluloses, 

 pentosans, etc., are as follows: (1) to serve as fuel for the 

 Uberation of energy ; (2) to serve as a source of body fat ; 

 and (3) to serve as a source of glycogen in the animal body. 



» Jour, of Biol. Chem. XIX, 1914, p. 373. 



