不同产羔数的乔达红羊成年母羊体型结构的分析

Analysis of the Body Structure of Adult Ewes of Qiaodahong Sheep with Different Litters

本研究旨在了解不同产羔数的乔达红羊成年母羊的体尺指标的内在联系以及其对体型结构的影响,并构建体尺与体重回归方程。利用SPSS 23.0对不同产羔数的母羊体尺指标进行统计分析,用主成分分析、聚类分析研究了体尺指标的内在联系以及其对体型结构的影响。结果表明,产羔数不同的成年母羊在体重、胸围、管围指数等方面差异显著(P<0.05),主成分分析发现体尺之间存在着不同的内在联系以及其对体型结构的影响程度不同,单羔母羊中第Ⅰ主成分所反映的综合信息量最大,贡献值为32.453%,主要受体型因子影响,双羔母羊中第Ⅰ主成分所反映的综合信息量最大,贡献值为38.910%,主要受尾部因子和宽度因子的影响;聚类分析显示当类间距为20时,单双羔母羊的体尺指标可聚为Ⅱ、Ⅳ类,表明产羔数不同的母羊体尺之间存在不同的关系。构建不同产羔数母羊的体尺与体重的回归方程,单羔母羊:Y=0.289 X 1(体长)+0.613 X 3(胸围)-24.752,双羔母羊:Y=0.325 X 2(体高)+0.288 X 3(胸围)+0.272 X 5(胸深)+0.188 X 8(尾宽)+0.724 X 10(管围)-17.087。

The purpose of this study is to understand the internal relationship of the body size indicators of adult ewes of different litter sizes and its influence on the body structure,and to construct the regression equation of body size and weight.SPSS 23.0 was used to statistically analyze the body size of ewes with different litter sizes,and principal component analysis and cluster analysis were used to study the internal relationship of body size indicators and its influence on body structure.The results showed that adult ewes with different litter sizes had significant differences in body weight,chest girth,pipe circumference index,etc.(P<0.05).Principal component analysis found that there were different internal connections between body measurements and their influence on body structure to different degrees,and the first principal component of single lamb ewe reflected the largest amount of comprehensive information,with a contribution value of 32.453%,which was affected by the main receptor type factor.The first principal component of double lamb ewe reflected the largest amount of comprehensive information and the contribution value was 38.910%,which was mainly affected by the tail factor and the width factor;cluster analysis showed that when the class spacing was 20,the body measurements of single and double lamb ewes could be grouped intoⅡandⅣcategories,indicating that the number of litters was different and different relationships between ewe body measurements.The regression equation of body size and weight of ewes with different numbers of litters was constructed,that was single lamb ewes:Y=0.289 X 1(body length)+0.613 X 3(chest girth)-24.752,double lamb ewes:Y=0.325 X 2(body height)+0.288 X 3(chest girth)+0.272 X 5(chest depth)+0.188 X 8(tail width)+0.724 X 10(pipe circumference)-17.087.