The amino acid requirements of the growing chick. I. Determination of amino acid requirements |
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| Authors: | D Hewitt D Lewis |
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| Institution: | 1. University of Nottingham, School of Agriculture , Sutton Bonington, Loughborough, LE12 5RD, England;2. National Institute for Research in Dairying , Shinfield, Reading, RG2 9AT, England;3. University of Nottingham, School of Agriculture , Sutton Bonington, Loughborough, LE12 5RD, England |
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| Abstract: | The amino acid requirements of the growing chick have been determined using a diet based on soybean meal and maize meal. The diet contained 18% protein (N% x 6.25, dry matter basis) made up to 14% contributed by conventional ingredients and 4% protein equivalent in the form of amino acids. Starting with a diet formulated to meet the reference levels recommended by Dean and Scott (1965) a programme of experiments was carried out to improve this amino acid balance. The results indicated that the growing chick requires not more than 0.53% threonine, 0.61% glycine, 0.79% valine, 0.62% isoleucine, 1.34% leucine, 0.75% phenylalanine (or 1.3% phenylalanine plus tyrosine), 0.85 % lysine, 0.4% histidine, 0.86% arginine, 0.17% tryptophan and 0.39% methionine (or 0.79% methionine plus cystine). |
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