奶牛体型数据变异及相关的研究

Study on Data Variation and Correlation for Type in Dairy Cattle

本研究利用北京荷斯坦牛38头公牛的2035头女儿15个线性体型性状（评分1～50分）和整体评分（评分51～100分）1988～1992年的评定资料，配合公畜模型研究了奶牛体型数据变异以及线性体型性状与整体评分之间的相关。方差分析的结果表明公牛、畜群、胎次和鉴定员效应是体型评定数据变异的重要来源。相关的研究结果表明；线性体型性状与整体评分之间的表型相关从－0．28（尻角度）到0．53（体高），遗传相关从－0．73（尻角度）到0．82（体高），环境相关从－0．14（后肢侧视）到0．51（体深）。

Study n data variaton and correlatins for 15 linear type traits (scored linearly 1 to 50 points) and final score (scored 51 t 100 pints) was conducted from Beijing Holsteins data by sire model.Data used for analysis were records of 2035 daughters of 38 sires collected from 1988 to 1992. The results of analysis of variance indicated that sire, herd of evaluation, lactatin of cows and classifier were important sources of variatin for linear type traits and final score. The results of correlatins indicated that phenotypic correlations between linear type traits and final score ranged from - 0. 28 (rump angle) to 0. 53 (stature), that genetic crrelations ranged from - 0. 73(rump angle) ti 0. 82(stature), and that environmental correlations ranged from - 0. 14(rear leg side view) to 0. 51 (body depth).