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Swine Nutrition and Feed Technology
Asian-Australasian Journal of Animal Sciences 1997;10(3): 284-288.
DOI: https://doi.org/10.5713/ajas.1997.284    Published online June 1, 1997.
Partition of amino acids requirement for maintenance and growth of broilers III. Tryptophan
J. H. Kim, W. T. Cho, I. S. Shin, C. J. Yang, In K. Han
Purified diets containing five graded levels of tryptophan were fed to growing chicks to evaluate tryptophan requirements for growth and maintenance. A model was developed to separate tryptophan requirement for maintenance from requirement for growth. From this model, the daily tryptophan requirement for growth was 2.16 mg/g gain, and the daily requirement for maintenance 0.029 times metabolic body size (Wg0.75). Based on nitrogen gain response, the tryptophan requirement for growth was 0.078 mg/mg N gain, and the daily maintenance requirement was 0.029 times metabolic body size. The total tryptophan requirements were 71.56 mg/day or 0.173% of the diet, 69.48 mg/day or 0.168% of the diet based on the weight gain response and nitrogen gain response, respectively. Previous tryptophan requirements for growing chicks aging 1-28 days are in close agreement with these estimates. Based on the relationship of weight gain and N gain, about 1.25% of the retained CP was consisted of tryptophan; the previously reported value of tryptophan content of chick muscle CP was 1.03%.
Keywords: Tryptophan; Requirement; Growth; Maintenance; Broiler Chicks

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