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Swine Nutrition and Feed Technology
Asian-Australasian Journal of Animal Sciences 1997;10(2): 178-184.
DOI: https://doi.org/10.5713/ajas.1997.178    Published online April 1, 1997.
Partition of amino acids requirement for maintenance and growth of broilers I. Lysine
J. H. Kim, W. T. Cho, C. J. Yang, I. S. Shin, In K. Han
Purified diets containing five graded levels of lysine were fed to a total of 125 growing chicks (25 chicks per treatment) to evaluate lysine requirements for growth and maintenance. A model was developed to separate lysine requirement for maintenance from requirement for growth. Based on weight gain response, the daily lysine requirement for growth was 12.06 mg/g gain and the daily lysine requirement for maintenance was 0.332 times metabolic body size (W0.75). Similarly, the lysine requirement for growth was 0.457 mg/mg nitrogen gain and the daily lysine requirement for maintenance was 0.344 times metabolic body size. The plateau of plasma lysine concentration was reached at 354.75 mg intake/day. The total lysine requirement was 414.27 mg/day or 1.0% of the diet, 420.11 mg/day or 1.01% of the diet based on weight gain response and N gain response, respectively. Previous lysine requirements for growing chicks of 1-28 days old were in close agreement with these estimates. As a percentage of protein, lysine requirement was calculated to be 7.3% and the reported lysine content of chick muscle crude protein of 7.46% was closely related.
Keywords: Lysine; Growth; Maintenance; Broiler Chicks

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