在动物营养学上,往往将碳水化合物分为两大类,即无氮浸出物和粗纤维。前者是指那些能够被一般的单胃动物所消化的一类碳水化合物,而后者是指那些不能被一般的单胃动物所消化的一类碳水化合物。关于粗纤维的定义目前尚存在着争议,但一般意义上的粗纤维通常是指那些来源于植物,但又不能被一般的单胃动物所消化的细胞壁成分,包括纤维素、半纤维素、木质素、果胶等。 In animal nutrition, carbohydrates are often divided into two broad categories, namely, nitrogen-free extract and crude fiber. The former refers to a group of carbohydrates that can be digested by a common monogastric animal, while the latter refers to a group of carbohydrates that can not be digested by a common monogastric animal. The definition of crude fiber is currently controversial, but in the general sense crude fiber refers to those cell-wall components that originate from plants but can not be digested by normal monogastric animals, including cellulose, hemicellulose, wood Prime, pectin and so on.