Oct. is, 1920 A cidity and A Ikalinity of Poultry Feed Mixtures 1 49 



We find, by a study of Table V, that the grain rations 9 and 11 are 



acid and that the mash is base. In these mash mixtures there has been 



added both bone meal and meat and bone meal. Wheat middlings also 



aid in overcoming the acidity of corn meal and of rolled oats. In this 



test the total intake excess was base. The percentage of protein calories 



was 22. 



CONCLUSIONS 



Grain mixtures as ordinarily used in poultry feeding are acid. 



Mash mixtures containing sufficient quantities of digester tankage, 

 meat and bone meal, dried milk, or dried blood will be base. 



Acid balances of feed mixtures can be overcome by the addition to 

 mashes of dried milk, digester tankage, meat and bone meal, bone 

 meal, dried blood, or ground limestone or oyster shell. Green feed, 

 milk to drink, and limestone and oyster-shell grit also aid in overcoming 

 the acid balance of grain mixtures. 



