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一、引论在法国进行的微量元素研究表明,铜和锌在大部分地区的饲料中均感不足(Bell-anger & Perigand 1973;Perigaud &Lamand 1973;De Moatard & Perigand1975)。这两种元素的缺乏特别发生在经常耕种、灌溉好的奥弗涅坡谷火山土上。因此牛群常发生缺铜锌病(Lamand 1970;1971;1976)。
I. INTRODUCTION Trace element studies conducted in France show that copper and zinc are deficient in most areas of feed (Bell-anger & Perigand 1973; Perigaud & Lamand 1973; De Moatard & Perigand 1975). The lack of these two elements occurs in particular on volcanic soils of the well-to-do, well-irrigated Auvergne Valley. Therefore, copper deficiency and zinc deficiency often occur in herds (Lamand 1970; 1971; 1976).