Effect of the Addition of Imbalanced Amino Acid Mixtures to a Low Protein Diet, on Weight Gains and Plasma Amino Acids of Chicks

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Abstract
Amino acid mixtures from which a single essential amino acid was omitted (arginine, isoleucine, leucine, lysine or valine) were incorporated into a diet containing 9.5% of soybean protein. Weight gain, feed consumption and the level of the dietary deficient amino acid in the plasma were reduced for chicks consuming these diets. Similar results were observed when zein was used rather than mixtures of amino acids. The depression in weight gain appears to have resulted from the ingestion of relatively large quantities of amino acids which had to be deaminated or excreted.

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