运用主成分综合函数法构建10周龄朗德鹅体尺评估模型

摘要

This experiment was conducted to study 12 body-size and body-weight traits,such as body weight (x1 ),body slope lengths(x2 ),neck length(x3 ),half-diving length(x4 ),neck girth(x5 ),back width(x6 ),chest width(x7 ),chest girth(x8 ),chest depth(x9 ),chest bone length(x10 ),shank length(x11 ),and shank girth(x12 ) in parternal line of 10-week Lande geese and maternal line of 10-week mother Lande geese.After measuring,the principal component analysis was carried out for the main traits of different geese,and the comprehensive evaluation model was established as y =0.255zx1 +0.231zx2 +0.175zx3 +0.247zx4 +0.225zx5 -0.196zx6 -0.203zx7 +0.221zx8 +0.246zx9 +0.235zx10 -0.185zx11 -0.200zx12 .The results showed that the first three character values were selected as the principal component which occupied 92.64%(>85%)of total information.The three com-ponents contained nearly all the original information.From the models established,the combined scores of body-size traits were obtained,the descending order of the scores was males of parternal line,males of maternal line, females of parternal line,and females of maternal line,which was consistent with expectations.%分别测定10周龄朗德鹅父系、母系公鹅和母鹅群体重（x1）、体斜长（x2）、颈长（x3）、半潜水长（x4）、颈围（x5）、背宽（x6）、胸宽（x7）、胸围（x8）、胸深（x9）、胸骨长（x10）、胫长（x11）和胫围（x12）等12个体重体尺指标，运用主成分法对朗德鹅体重体尺指标进行分析，建立10周龄朗德鹅体尺评估模型：y ＝0．255zx1＋0.231zx2＋0．175zx3＋0．247zx4＋0．225zx5－0．196zx6－0．203zx7＋0．221zx8＋0．246zx9＋0．235zx10－0．185zx11－0.200zx12。结果表明：前3个主成分的累积贡献率为92.64％（＞85％），基本反映了原体重体尺指标包含的全部信息。运用构建的评估模型计算各群体体型综合得分，父系公鹅得分最高，其次分别是母系公鹅、父系母鹅，母系母鹅得分最低，与预期结果一致。