中国西门塔尔牛线性体型评分、功能分及整体评分转换方法的研究

Study on Transmitting Method from Linear Score to Functional Score and Functional Score to Total Score for Chinese Simmental

研究制定了乳肉兼用中国西门塔尔牛的线性评分向功能分的转化标准,同时在中国西门塔尔牛育种委员会(CSA)规定的特征性状的基础上应用功能分的遗传方差的相对比例作为权重,推导出功能分进入整体评分的权重。根据西门塔尔牛1840头基础母牛的线性评分数据验证,总体评分与泌乳速度、305d产奶量分别呈现较强正遗传相关分别为0 61和0 34;与产犊间隔、体细胞数(SCC)、乳脂产量的负相关分别为-0 32、-0 23和-0 05,证明该转换方法能较好的体现中国西门塔尔牛育种目标和兼用性能,但还有待于在实践中进一步检验。

The transformation table from the type trait linear score to functional score was made and the transformation method is studied as well which used the relative scale of genetic variances of linear trait functional score as the weight to form the total score.The result shows that the genetic correlation among total score and milk speed,305 days milk yield are 061 and 034 respectively,while that genetic correlation among total score and birth interval,the number of body cells,milk fat yield are -032,-023,and -005.This result represents that the method of weighting in this paper and the standard transmitting linear score to functional score are successful,but it still need more practice results.