AUTHOR'S METHOD OF FEEDING 171 



skim milk may be secured almost anywhere, and soy 

 beans or cow peas can be grown in the warmer climates, 

 while Canada field peas will thrive in cooler countries. 



The carbonaceous feeds in general must be used to 

 make up the carbohydrate part of the ration, and the 

 nitrogenous feeds to furnish the bulk of the protein. All 

 carbonaceous feeds contain some protein and almost all 

 nitrogenous feeds contain some carbohydrate; conse- 

 quently, in the selection of feeds for a ration they should 

 be combined in such quantities that the proper amount of 

 digestible nutrients is supplied. 



Water is found to a greater or less extent in all feeds. 

 Those classified as dry feeds usually contain only a small 

 quantity, about 8 to 18 per cent. Other feeds such as 

 liquid feeds and succulent feeds contain as high as 85 to 

 90 per cent. However, since these sources of water, ex- 

 cept that of the liquid feeds, are not sufficient, the pigs 

 must be fed water directly as such. In order to get best 

 results it is undoubtedly necessary, as shown by experi- 

 mental data, to feed the right quantity of water as well 

 as the right quantity of the other nutrients. 



While the pig is an animal primarily adapted to the 

 use of concentrates, and under five or six months of age 

 apparently cannot assimilate as much as he can digest, 

 best results are obtained if he is not fed more than he 

 can finally use for the construction of body tissue and for 

 necessary energy and heat production. In order to limit 

 the nutrients to the amount that the pig can most profit- 

 ably use, roughages may be introduced into the ration 

 at this time. These serve a double purpose : First, they 

 satisfy the appetite of the pig; second, they have a 

 tendency to increase his capacity so that later in life, 

 when he otherwise would not eat as much as he could 



