14 



The Bulletin. 



Functions of Food in the Animal Body. 



Food nourishes and supports the body 

 By supplying— 



1. The materials of which it is made. 



2. The materials to repair its waste and wear. 

 By producing — 



3. Heat to keep it warm. 



4. Force and energy for muscular and other work. 



These offices are performed by the nutrients: 



{ ^Mlich is the basis of blood, lean meat, tendons, lig- 

 Protein. . J aments, sinews, hair, skin, etc. 

 I Is converted into fats. 

 I^Is used as fuel for heat and force, 



f Are used as fuel for heat and force. 



( Are stored in the fatty tissue of the body. 



Carbohydrates ^ 

 (IST.-free Ext. ! Are converted into fats and stored in the body, or 



and I Are used as fuel for heat and force. 



Crude Fiber) J 



Mineral f Forms bone and a very small part of muscular and 



Fats, 



Matter. \ fatty tissues. 



Classification of Feeding Stuffs. 

 Feeding stuffs may be classified as follows: 



Value of Concentrated Feeds. 



The value of feeding materials depends, first, on their composition, 

 which has already been discussed, and second, on their 



Digestibility. — All feed eaten by an animal is not digested and 

 used in nutrition, but only that portion which is dissolved by the 

 alimentary agents and taken into the circulation of the system, the 



