甘南草地型藏羊体质量与体尺指标的相关性研究

Regression analysis between body weight and body size of Gannan Tibetan sheep

采用多元逐步回归分析方法,对随机抽测的甘肃省甘南州草地型藏羊225只成年公羊和290只成年母羊的体质量和主要体尺指标进行了相关性分析.结果表明:甘南草地型藏羊成年公羊体质量和主要体尺指标的最优回归方程为y=0.118x1+0.652x3+0.196x4(R=0.901,0.01<P<0.05);成年母羊体质量和主要体尺指标的最优回归方程为y=0.111x1+0.186x2+0.626x3(R=0.849,P<0.01).回归模型显示,胸围和体高是影响甘南草地型藏羊体质量的主要体尺指标,建议在今后的选育工作中加大对胸围和体高的选择力度,以提高藏羊的平均体质量.

In order to make some suggestion for development and breeding selection of Gannan Tibetan sheep,multiple regression analysis between body weight and body size of sheep was made with 225 male and 290 female sheep randomly selected.The results showed that the optimized regression equation was as y=0.118x1＋0.652x3＋0.196x4（R=0.901,0.01P0.05） for male sheep,and y=0.111x1＋0.186x2＋0.626x3（R=0.849,P0.01） for female sheep.Chest girth and body height were major body size factors affecting the body weight of Gannan Tibetan sheep.It is suggested that chest girth and body height should be considered as major selection items for breeding.