澳洲白羊体质量与体尺指标的相关及回归分析

Correlation and regression analyses of the body weight and body sizes in Australian white sheep

中文关键词: 澳洲白羊  体质量  体尺  相关性分析  通径分析  逐步回归分析

英文关键词: Australian white sheep  body weight  body size  correlation analysis  path analysis  stepwise analysis

中文摘要:

      【目的】研究澳洲白羊体质量与体尺指标的相关及回归关系，为肉羊新品种选育提供参考。【方法】采用SPSS19.0软件对6月龄澳洲白羊体质量与体尺指标进行相关性分析、通径分析、逐步回归分析，并对其相关系数进行分解，得出了体质量与体尺指标之间的最优回归方程。【结果】体质量（y）与管围（x6）和胸围（x3）相关性极显著（P<0.01），其相关系数分别为0.680、0.501；与体高（x1）相关性显著（0.010.05）。胸围（x3）和管围（x6）是影响其体质量（y）的主要因素，且体高（x1）、体斜长（x2）、胸围（x3）胸深（x4）主要是通过管围（x6）对体质量产生间接作用，胸宽（x5）和管围（x6），主要是通过胸围（x3）对体质量产生间接作用。澳洲白羊体质量（y）和体尺指标之间的最优回归方程为y = -39.698＋0.355 x3＋5.064 x6 (Ｒ＝0.752，Ｐ＜0.05），标准化后的回归方程为y＝0.334 x3＋0.585 x6（F=18.815，Ｐ＜0.01）。【结论】建立了澳洲白羊体质量与胸围和管围之间的最优回归模型。

英文摘要:

      【Objective】To study the correlation and regression relationship of body weight and body size indicators in Australian white sheep and provide reference data for breeding sheep germplasm innovation application.【Method】The phenotypic correlations，path coefficients，direct and indirect correlations between the body weight and several body sizes of Australian white sheep were analyzed by SPSS 19. 0 software.【Result】The cannon bone circumference (x6) and chest circumference (x3) showed significant correlations with the body weight at the 0.01 level．The phenotypic correlations were 0.680, 0.501. The body height (x1) showed significant correlations with the body weight at the 0.05 level and the phenotypic correlations were 0.393. The body length (x2), chest depth (x4) and chest width (x5) did not show significant correlation with the body weight at the 0.05 level. The chest circumference (x3) and cannon bone circumference (x6) are the main factors affecting the body weight. The body height (x1), body length (x2), chest circumference (x3) and chest depth (x4) had indirect influence by cannon bone circumference (x6) mainly. The chest width (x5) and cannon bone circumference (x6) had indirect influence by chest circumference (x3). The optimum regression equation between the body weight and body size in Australian white sheep was：y = -39.698＋0.355 x3＋5.064 x6 (Ｒ＝0.752, Ｐ＜0.05）and the normalized form of it was：y＝0.334 x3＋0.585 x6 （F=18.815, Ｐ＜0.01）.【Conclusion】The optimal regression model was established between body weight and chest circumference and cannon bone circumference in Australian white sheep.