奶牛早期选种方案的探讨

Approach to Working out Herd Early Selection Plan of Dairy Cows

从不同角度分别对成母牛群和后备牛群早期选种方案的制定方法、实施原则和步骤进行了探讨。成母牛群的早期选种应从牛群结构、选配计划和个体生产水平等方面综合考虑;后备牛群早期选种则应根据其系谱资料和本身生长发育状况来确定。

Being worked out herd early selection plan is one of the most important tasks to dairy herd breeding .The methods of working out herd early selection plan and the principles and steps of carrying out it were approached to adult cows and replacement cows respectively in different sights in this paper.It was thought that some factors, such as herd structurd,selected mating and individual yield level must be comprehensive survied in the early selection plan of aduls cows; But that of replacement cows should be determined by cows genealogies and growing and developing condition.