COMMERCIAL FEEDING-STUFFS 



271 



The meat and fish offals vary greatly according to 

 proportion of bone which they contain. The percentage 

 of protein is always large, nevertheless. Dried blood is 

 much less rich in mineral matter and fat than other 

 slaughter-house offals are generally, and the proportion of 

 protein is correspondingly larger. All these materials 

 are excellent poultry foods when used as a part of the 

 ration. They may be fed to swine also as an amendment 

 to cereal grains when dairy by-products are not available. 



