The amino acid requirements of the growing chick. II. Growth and body composition of chicks fed on diets in which the proportions of amino acids are well balanced |
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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 for the growing chick determined by Hewitt and Lewis (1972a) were tested at different protein levels. Satisfactory growth was obtained with 22 to 24% protein in the diet dry matter. Nitrogen balance data indicated that a good balance between amino acids, with no deficiencies, had been achieved. The results of Hewitt and Lewis (1972a) were evaluated in conjunction with other published reports and a new set of requirement values derived. These were tested in a second experiment at different protein and energy levels. Excellent growth was recorded to 3 weeks of age when the diet satisfied these values and contained 0.9% lysine and 21% protein with a metabolisable energy value of 3.25 kcal/g. |
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