Avian Disease Virus and Nutrition Relationships

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Abstract
Newcastle disease virus (NDV) involvement, in the immature White Leghorn cockerel, resulted in a greater growth depression when complete rations rather than those imbalanced by deficiencies of lysine were supplied. Trypsin or amylase supplementation of a low-lysine diet resulted in increased growth of NDV-infected chicks. This phenomenon was observed, however, only when the experimental rations were deficient in lysine.