影响鲁西黄牛开放核心群育种方案的因素分析

在现行鲁西黄牛青年公牛体系和二阶开放核心群育种方案的基础上,利用确定性模型评估现行方案的育种效果,分析了影响现行方案育种效果的因素。结果表明,在现行育种方案中,单一增加主动育种群比例、群体规模,遗传进展和育种效益随之增加;增加种子母牛的比例,遗传进展和育种效益达到峰值后缓慢减少;增加测验公牛数,遗传进展和育种效益缓慢增加;扩大开放程度,育种效益和育种进展缓慢,增加到一定值后随之减少。以上结果说明,通过对现行育种方案的优化,可以提高育种效率。

Factor Analysis of Breeding Scheme for Open Nuclear Population of Luxi Cattle

On the basis of the current two-tire nucleus breeding scheme and young bull system for Luxi cattle,deterministic simulation was used to evaluate the breeding efficiency of current scheme.The factors on breeding results of current scheme were analyzed.The results show that only enlarge population and increase nucleus size,it will increase genetic gains and profit,and increasing ratio of seed cow,it will slowly decrease genetic gains and profit after reaching climax.Enlarge number of test bulls;it will increase slowly genetic gains and profit.And widen open degree,it will increase slowly genetic gains and profit after reaching climax.These results suggest that breeding efficiency will be increased by optimizing current breeding scheme.