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锌是动物的必需元素,由于其在体内广泛的生理生化功能而被称为“生命元素”,传统上,动物日粮中的锌是以无机盐的形式供应的。在家禽日粮中,通常以无机盐的形式来补加锌,然而,在体内发生作用的是锌的有机物或螯合物,而不是游离的无机锌离子。因此,可以推断,无机锌的生物学效应要取决于其转化成有生物学活性的有机锌的能力,有机锌更接近于其在体内的作用形式,生物学效价要高于无机锌。有机锌在消化道中稳定存在,不会与其它物质形成阻碍吸收的复合物,能更有效的由小肠绒毛转运到细胞上皮,然后转化成具有生化功能的形式。
Zinc is an essential element of animals and is called a “living element” because of its extensive physiological and biochemical functions in the body. Traditionally, zinc in animal diets has been supplied as an inorganic salt. In poultry diets, zinc is usually added in the form of an inorganic salt, however, rather than free inorganic zinc ions, organic or chelates of zinc act in the body. Therefore, it can be inferred that the biological effects of inorganic zinc depend on its ability to convert into biologically active organic zinc, which is closer to its active form in vivo with a higher biological potency than inorganic zinc. Organozinc is stable in the digestive tract, does not form an absorption-inhibiting complex with other substances, transfers more efficiently from the intestinal villi to the cell’s epithelium, and then into biochemical-functional forms.