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AVERY T. B., 1940, POULTRY SCI, V19, P321, DOI 10.3382/ps.0190321
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BENNION NOEL L., 1933, POULTRY SCI, V12, P69, DOI 10.3382/ps.0120069
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CONRAD RALPH M., 1939, POULTRY SCI, V18, P327, DOI 10.3382/ps.0180327
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GABUTEN AR, 1952, POULTRY SCI, V31, P917
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ROSENBERG HR, 1945, CHEM PHYSL VITAMINS, P333
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WARREN D. C., 1940, POULTRY SCI, V19, P67, DOI 10.3382/ps.0190067