动物饲料 脂肪含量的测定

[中文适用范围]： 本标准规定了动物饲料中脂肪含量的测定方法。 本方法适用于除油籽和油籽渣以外的动物饲料。 出于本方法的目的，区分以下两类动物饲料。 B 类产品样品在提取之前需要水解步骤。 B 类： ——动物源直接饲料，包括奶制品； ——植物来源的直接饲料，未经事先水解就无法提取脂肪；特别是：麸质、酵母、大豆和马铃薯蛋白以及热处理饲料； ——含有上述产品的配合饲料，其含量至少有 20% 的脂肪含量来自这些产品。 A 类： ——B 类中未提及的动物饲料。 注：对于油籽残留物，ISO 734-1 [2] 中规定了通过己烷萃取测定“油含量”的方法，而测定ISO 736 [3] 中规定了乙醚萃取的“油含量”。 对于油料种子，ISO 659 [1] 规定了通过己烷萃取测定“含油量”的方法。 [外文原描述]： This International Standard specifies a method for the determination of the fat content of animal feeding stuffs. The method is applicable to animal feeding stuffs except oilseeds and oilseed residues. For the purposes of this method, the following two categories of animal feeding stuffs are distinguished. Samples of products in category B need a hydrolysis step prior to extraction. Category B: straight feeds of animal origin including milk products; straight feeds of vegetable origin from which fats cannot be extracted without prior hydrolysis; in particular: gluten, yeast, soya and potato proteins, and heat-treated feeds; compound feeds containing the preceding products in such quantities that at least 20 % of the fat content stems from these products. Category A: animal feeding stuffs not mentioned under category B. NOTE For oilseed residues, a method for the determination of the "oil content" by hexane extraction is specified in ISO 734-1 [2], whereas a method for the determination of the "oil content" by diethyl ether extraction is specified in ISO 736 [3]. For oilseeds, a method for the determination of the "oil content" by hexane extraction is specified in ISO 659 [1].