ブロイラーのトリプトファン要求量に及ぼす加齢および蛋白質含量の影響

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  • Tryptophan Requirement in Female Broilers Affected by Age and Dietary Amino Acid Levels.
  • ブロイラーのトリプトファン要求量に及ぼす加齢および蛋白質含量の影響〔英文〕
  • ブロイラー ノ トリプトファン ヨウキュウリョウ ニ オヨボス カレイ オヨビ

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The reported tryptophan requirement for the maximum performance of broilers ranges widely. The amino acid requirements are affected by many factors. In this experiment, the effects of age and dietary protein levels on the tryptophan requirement were investigated. <br>The experiment at 3 growing stages from 8 to 18, 25 to 35 and 42 to 52 days after hatching was conducted using female Arbor Acres strain broilers. The experimental feeds contained five graded concentrations of tryptophan in four levels of amino acid. At the end of each growing stage, the body weight gain and feed consumption were recorded.<br>The dietary tryptophan concentrations for the maximum performance of body weight gain expressed as a percentage of diet could be calculated clearly, but those from feed efficiency were uncertain values because of a large confidence interval. Those from body weight gain ranged from 0.111 to 0.159% of diet, had a tendency to decrease with age, and increased with increasing dietary amino acid levels. But those expressed as a percentage of dietary crude protein (CP) remained relatively constant with increasing dietary CP levels.

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