[本文原著包括锌的营养效用和摄入过多时的毒性作用。关于前一部分内容在本刊1974年第1期《人体营养的微量元素》已做过类似的介绍。由于锌是一个重要工业原料,其化合物也往往用于医疗,在一些特殊情况下也有过多摄入的可能,故就其毒性方面节译如下——译者]。在饲料中含锌量为2,500 ppm时,未使大鼠产生任何中毒症状,但若剂量较大则会出现中毒。每日饲大鼠500～700毫克锌,在3～5周内使动物体内铁的储存 This article includes the original nutritional effects of zinc and toxic effects of excessive intake. A similar introduction has been made on the contents of the previous section in “The Trace Elements in Human Nutrition”, Issue 1, 1974. As zinc is an important industrial raw material, its compounds are also often used in medical treatment, and in some special cases there is also the possibility of excessive ingestion. Therefore, the section on toxicity is as follows. No zinc poisoning was observed in rats when the zinc content in feed was 2,500 ppm, but poisoning occurred at higher doses. Rats were daily fed 500 to 700 mg of zinc, which allowed the animals to store iron within 3 to 5 weeks