求翻译：番鸭在1-21日龄育雏阶段饲喂高、中、低三种不同的蛋白水平的日粮均能达到同样的增重效果，但蛋白质水平为21.0%和22.0%时，饲料转化率较高。是什么意思？

Muscovy duck brood stage in 1-21 days of age were fed high protein levels in three different diets can achieve the same weight gain effect, but the protein level of 21.0% and 22.0%, feed conversion ratio than high.

Duck in the 1-day-old 21 how much Kangaroo feeding phase feeding High, Medium, and low 3 different levels of the protein, grain can be added to achieve the same effect, but the protein level is 21.0 % and 22.0 % fodder when you conversion rate is high.

The muscovy duck broods the stage in 1-21 date age to feed the high, middle and low three kind of different protein level the date grain to be able to achieve same increases the heavy effect, when the protein level is 21.0% and 22.0%, the feed conversion rate is high.

Muscovy duck in 1-21 age brooding stage effect of high, medium and low three kinds of diets with different protein levels can achieve the same weight, but when the protein level and 21%, high feed conversion rate.

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