【摘要】 对24头九龙牦公牛和252头牦母牛的9个体型线性性状进行主成份和因子分析,牦公牛被提取3个因子,累积方差贡献率达86.407%,分别是:体型综合信息因子、胸宽因子和十字部高———腰角宽因子;牦母牛被提取5个因子,累积方差贡献率达81.931%,分别是:高度因子、后躯———长度因子、胸部特征因子、管围因子和胸宽———尻斜长因子。牦公牛3个因子表达式分值、牦母牛5个因子表达式分值,用于牦牛体型评估,具有较高的选育和经济价值。更多还原

【Abstract】 Principal component analysis for nine linear type traits was conducted from24adult Joulong male yaks and252adult Joulong female yaks.Three factors were distilled for the male and their cumulative eigenvalues of variance accounted for86.407%of the total variance in type scores.According to rotated component matrix the first of these was called as the Body integrated factor and the second was called as the Chest width factor and the third was called as the Height at hip cross-hip width factor.Five factors were distilled for the female and their cumulative eigenvalues of variance accounted for81.931%of the total variance in type scores all of them were named as differently:(1)the Stature factor,(2)the Rearward body-length factor,(3)the Chest trait factor,(4)the Circamference of cannon bone factor,(5)the Chest width-rump lengthe factor.The formulas of three factors for male and five for female can be applied to evaluate the capability of Joulong yak and which has the great value for breeding and production.更多还原