The dynamic requirements of tryptophan in the broilers at different growing stages under low-protein diets.

As the Trp levels increased in low protein diets, there was a highly significant quadratic change in FBW, ADFI and ADG of female broilers ( P < 0.05), predicting the optimal response dose as 0.177, 0.175 and 0.176 Dig.Trp/Dig.Lys ratio.

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In present experiment, through all three stages, as Trp level increased in low-protein diets, the growth performance of broilers showed a trend of first increasing and then decreasing.

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