This practice can lead to excess levels since little reliance is placed on the natural vitamin content of feedstuffs. 这种实践结果，由于很少注意饲料中天然的维生素含量，就能出现含量过多的问题。
It was concluded that Dumas method can be used as a regular method for determination of nitrogen contents in feedstuffs or diets. 杜马斯燃烧法可以作为测定动物饲料和饲粮含氮量的常规方法。
