Sept., 1941] PROTEIN REQUIREMENTS OF CHICKENS 15 



REFERENCES 



1 Almquist, H. J. "Sources and Nature of the Chick Gizzard Factor." — Journ. 

 nutr. 14 :241. 1937. 



2. Bird, H. R., O. L. Kline, C. A. Elvehjem and E. B. Hart. "The Distribution 



and Properties of the Anti-Gizzard Erosion Factor Required by Chicks." 

 Journ. nutr. 12:571. 1936. 



3. Tepper, A. E., R. C. Durgin, and T. B. Charles. "Protein Requirements of 



Chickens at Various Stages of Growth and Development." N. H. Agr. Exp, 

 Sta. Bui. 312. 1939. 



4. Tepper, A. E. "Studies on Gizzard Ulceration in Chickens." Thesis, Univ. 

 of Maryland. 1941. 



