Problems of early culling of cows in breeding stocks for milk production

P. Perisic, R. Relic, C. Mekić, S. Stepić
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Abstract

A common problem of dairy cattle in all production systems and production directions is their reduced production life and therefore their reduced lifetime span. Among the main reasons of dairy cattle premature culling the problems related to reproduction, udder and legs are prevailing. The order of these reasons according to their significance is not the same in all dairy cattle populations and depends on production direction, level of production and specific technology of cattle breeding. There are also other reasons of culling but these three groups are the main ones. Due to frequency of their incidence, as well as economic damage which they can cause in dairy cattle production, today they must be taken into account when defining breeding goals for certain breeds and populations of cattle.
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产奶种牛早期扑杀的问题
所有生产系统和生产方向的奶牛的一个共同问题是它们的生产寿命缩短,因此它们的寿命缩短。在奶牛过早淘汰的主要原因中,与繁殖、乳房和腿有关的问题普遍存在。这些原因的重要性排序在所有奶牛种群中并不相同,取决于生产方向、生产水平和奶牛养殖的具体技术。还有其他的淘汰原因,但这三个群体是主要的。由于它们发生的频率,以及它们在奶牛生产中可能造成的经济损失,今天在确定某些品种和牛群的育种目标时必须考虑到它们。
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