Food principles, or food compounds, include protein, carbo- 

 hydrates and fats. 



The nutritive ratio is the ratio between the amount of di- 

 gestible crude protein and the carbohydrates and fats in any 

 given feed. It is found by multiplying the amount of digestible 



l\ 



nus. . 



Cecum 



AloufK 



G-u/let 



Stomach, or 

 PrOi'crifr'iculus 



cT-Gi sxnrd. 



.T-'sinofeas 

 -ZDuocienuiii 



-Jnfesf/ne 



Digestive Organs of a Wen 



fats by 21/4, adding it to the digestible carbohydrates and divid- 

 ing the sum by the amomit of digestible protein. 



We should also have some knowledge of the digestive appara- 

 tus of the hen if we wish to thoroughly understand her needs. 

 This plate represents the digestive organs extending from the 



