【摘要】 采用 6个国家级种畜场 1980～ 2 0 0 0年间的数据对中国西门塔尔牛 2 1年来的育种效果进行分析。对主要性状的遗传力、遗传相关进行了估计 ,并计算出总性能指数。所有性状均采用动物模型并利用MT DFREML(多性状非求导 )软件进行分析。更多还原

【Abstract】 Data of Chinese Simmental were collected from 6 livestock breeding farms at national level to evaluate the breeding effect of Chinese Simmental over 21 years. Besides evaluating the genetic parameters, we also evaluate the TPI (Total Performance Index) . Inbreeding coefficients were also analyzed in this study. The traits analyzed were 305-day milk yield, milk fat percentage, body weight at 18 months and score of body type. Their heritabilities are 0.35, 0.2, 0.31 and 0.18 respectively. The results indicate that it can control the coefficient of inbreeding effectively using ONBS,and the milk yields have increased greatly over 21 years of breeding.更多还原