Milk contains tryptophan, an essential amino acid that is a natural dietary sleep inducer.
牛奶中的色氨酸是一种天然促进睡眠的人体必需氨基酸。
In conclusion, the interrelationship between niacin and tryptophan in diets is supported by significant effects of dietary niacin on tryptophan requirement of Pekin ducks.
综合以上试验结果得出，北京鸭饲粮中烟酸与色氨酸之间的互作关系表现在饲粮烟酸水平对色氨酸需要量产生显著影响。
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