营养素需要量

黄鳝的营养素需要量及饲料最适能量蛋白比

Requirements of nutrients and optimum energy protein ratio in the diet for Monopterus albus

妊娠和哺乳在妊娠期和哺乳期，所有营养素的需要量都增高。

Pregnancy and lactation : Requirements for all nutrients are increased during pregnancy and lactation .

由于很多营养素的需要量不是正态分布的，那么人群其他的变异频率就有必要考虑了。

Because the requirements for many nutrients are not normally distributed , other considerations of population variability frequently are necessary .

婴儿和儿童婴儿和儿童对能量和必需营养素的需要量高，其营养低下的危险性也高。

Infancy and childhood : Because of the high demand for energy and essential nutrients , infants and children are at particular risk of undernutrition .

由于很多营养素的平均需要量不能很好的确定，所以很难评价RDA。

Since the mean requirement for many nutrients is not known with certainty , it is often difficult to establish an RDA .