Oct. 15, 1920 Acidity and Alkalinity of Poultry Feed Mixtures 



145 



Bone is rich in calcium and also contains other bases such as sodium. 

 As stated before, sour milk functions as base. 



Table III.- — Acid-base balance of rations 1 to 7 



Expressed in excess cubic centimeters per pound of feed. 



In this work no account has been taken of the amount of calcium 

 entering the crop as grit and oyster shell. This will, in all probability, 

 overcome the acid reaction, though without definite data this is a mere 

 guess. 



In a large table of studies of rations furnished by the medical staff of 

 the United States Army, the percentage of protein calories ran from 10 to 

 18. In the present work the percentage of protein calories ran from 13 

 to 22, according to the estimate of the actual intake in each period. 

 There is a possibility, however, that we will need to pay more attention 

 to the source or kinds and quantities of protein calories, since we have 

 shown in this work that those birds that received animal food, including 

 milk, tankage, meat and bone meal, and dried blood were prepared by 

 the storing up of the proper potential energy to begin heavy egg pro- 

 duction very young, while those birds that did not receive animal food 

 of any kind were not prepared and did not go into early heavy egg 

 production. 



