Abstract
WHILE there has been a good deal of disagreement as to the protein requirement of hens, it has been apparent that certain investigators (Thornton et al., 1957; Miller et al., 1957; Johnson and Fisher, 1959; and Frank and Waibel, 1960) have achieved good levels of egg production at around 12% dietary protein. The protein assay data of the latter workers, using a high energy corn-soybean oil meal diet containing 10% animal fat, indicated that hens fed 8, 10.2, 12.4 and 14.9% dietary protein produced approximately 30, 39, 54, and 67% egg production, respectively. It was apparent that in work attempting to determine the limiting amino acids in corn-soybean type diets it would be necessary to reduce the protein level to approximately 10% to provide a measurable response range.The objectives in this work were to determine laying hen production characteristics induced by corn-soybean oil meal diets containing 9, 10, 12, …
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