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四、其它抗营养因子与毒素类１．环丙烯类是含有环丙烯核化合物的总称。环丙烯类主要指具有这种特殊结构的脂肪酸———苹果酸和棉葵酸，它们也是饲料中的重要抗酶，主要来源于棉籽和棉籽饼粕。这类抗酶在榨油过程中很难被消除。动物肝脏中存在一种不饱和酶，又称脱氢酶或去饱
Fourth, other anti-nutritional factors and toxins 1. Cyclopropenes are generic names for cyclopropene compounds. Cyclopropenes mainly refers to the fatty acids with this special structure --- malic acid and plumbagic acid, which are also important anti-enzymes in feed, mainly from cottonseed and cottonseed meal. Such anti-enzyme in the oil extraction process is difficult to eliminate. There is an unsaturated enzyme in animal liver, also known as dehydrogenase or desaturated