新疆也木勒白羊公羊体尺指标对体重影响力的分析

Analysis of the Influence of Body Size Index of Xinjiang Yemule White Sheep Ram on Its Body Weight

【目的】对也木勒白羊公羊体尺指标对体重的影响力进行关联性分析,为也木勒白羊公羊的选种提供理论依据。【方法】随机测量50只2周岁也木勒白羊公羊的体重及体尺指标,将数据录入Excel表格整理,用SPSS19.0进行统计分析、相关性分析、通径分析和逐步回归分析。【结果】所有指标中脂臀厚变异系数最大,为13.32%。体高、体长、胸围、胸宽、胸深、脂臀长、脂臀宽、脂臀厚均与体重呈极显著相关性,管围与体重呈显著相关性。胸围与体重的相关系数最大,为0.886,管围与体重的相关系数最小,为0.336。胸围对体重的直接影响作用最大,为0.34,胸深对体重的间接作用最大,为0.751。胸围、胸宽对也木勒白羊体重的影响既有较强的直接作用,又有较强的间接作用。筛选出影响也木勒白羊体重较主要的四个体尺指标为胸围、胸宽、体长、脂臀宽;【结论】也木勒白羊体重与体尺最优的线性回归方程为y=-65.113+0.647x3(胸围)+0.518x8(脂臀宽)+1.248x1(胸宽)+0.378x2(体长)。

【Objective】 In this paper, the influence of body size index on body weight of Yemule sheep was analyzed by different statistical analysis methods in the hope of providing theoretical basis for ram selection.【Methods】 The experiment was conducted at the breeding base of the Yemule White Sheep Breeding Promotion Center in Emin County. The body weight and body size indicators of 50 2 year old Yemule White Sheep rams were randomly measured. The data were entered into an Excel spreadsheet for preliminary preparation. After that, statistical analysis, correlation analysis, path analysis and stepwise regression analysis were performed with SPSS 19.0;【Results】 The coefficient of variation of fat-thickness thickness was the highest in all indicators, which was 13.32%. Correlation analysis showed that body height, body length, chest circumference, chest width, chest depth, fat hip length, fat hip width, and fat hip thickness were significantly correlated with body weight, and tube circumference and body weight were significantly correlated. The correlation coefficient between chest circumference and body weight was the largest, 0.886, and the correlation coefficient between tube circumference and body weight was the smallest, 0.336. Path analysis showed that the direct effect of chest circumference on body weight was the largest, 0.34, and the indirect effect of chest depth on body weight was the largest, 0.751. The effect of chest circumference and chest width on the weight of Yemule White Sheep not only had a strong direct effect, but also a strong indirect effect. Through stepwise regression analysis, four main body size indexes were selected as chest circumference, chest width, body length and fat hip width.【Conclusion】 The linear regression equation of body weight and body size is also y=-65.113+0.647x 3 (chest circumference)+0.518 x 8 (fat hip width)+1.248 x 1 (chest width)+0.378 x 2 (body length).