经用典型日粮配方计算，再与猪、鸡营养需要量比较，对我省猪、鸡饲料中微量元素的盈缺作出了判定。
Through checking the available contents of trace elements in typical diets with the nutrient requirement of swine and chicken, whether the elements are surplus or deficient is discriminated.
当饲粮烟酸缺乏时，1 ~ 14日龄北京鸭色氨酸需要量显著升高。
The tryptophan requirement of Pekin ducks aged 1 to 14 days significantly increases when niacin is deficient in diets.
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