不同日龄樱桃谷鸭体质量与体尺性状的主成分分析

Principal Component Analysis of Body Weight and Body Size Traits of Cherry Valley Duck at Different Ages

为了研究不同日龄樱桃谷鸭体质量与体尺性状之间的关联性,分别对18日龄和45日龄樱桃谷鸭(各60只,公母各半)的体质量和体尺性状进行主成分分析。结果表明,18日龄和45日龄樱桃谷鸭体质量的变异系数最大;二者的体质量与体斜长、胫围、胸围、胸骨长、胸宽、背宽之间呈极显著或显著正相关(P<0.01或0.05);18日龄樱桃谷鸭胫长与半潜水长之间达到极显著正相关水平(P<0.01),与胸围呈现显著负相关(P<0.05);45日龄樱桃谷鸭胫长只与体斜长之间呈显著正相关(P<0.05);其他体尺性状之间存在着不同程度的相关性。主成分分析结果表明,18日龄和45日龄樱桃谷鸭体质量与10项体尺性状指标均可以综合为5个主成分指标,累计贡献率分别为85.147%、87.277%;18日龄樱桃谷鸭的各主成分中,分别以背宽、胫长、胸骨长、颈长和胫围对主成分的贡献率最大,背宽、体质量和体斜长对主成分1的贡献率大小相近;而45日龄樱桃谷鸭分别以体质量、颈长、胫长、胫围和半潜水长对主成分的贡献率最大,体质量、体斜长和胸深对主成分1的贡献率大小相近。综上,樱桃谷鸭的早期选育信息性状中应包括体质量、体斜长、颈长、胫长和胫围。

In order to study the relationship between body weight and body size traits of Cherry valley ducks of different ages,principal component analysis was carried out on body weight and body size traits of 18-and 45-day-old Cherry valley ducks(60 each,half male and half female).The results showed that the largest variation coefficient was found in the body weight of 18-and 45-day-old Cherry valley ducks.There was a significant or a highly significant positive correlation between body weight and body oblique length,shank circumference,chest circumference,sternum length,chest width and back width(P<0.01 or 0.05).The shank length of 18-day-old Cherry valley ducks was positively correlated with the semi-diving length(P<0.01)and negatively correlated with the chest circumference(P<0.05).There was a significant positive correlation between shank length and body oblique length of 45-day-old Cherry valley ducks(P<0.05).There were different degrees of association among other body size traits.The results of principal component analysis showed that the body weight and ten body size traits of 18-and 45-day-old Cherry valley ducks could be integrated into five principal component indexes,and the cumulative contribution rates were 85.147%and 87.277%,respectively.Among the five principal components of 18-day-old Cherry valley ducks,the back width,shank length,sternum length,neck length and shank circumference had the highest contribution to principal components.Moreover,the contribution of back width,body weight and body oblique length to principal component 1 was similar.Among the five principal components of 45-day-old Cherry valley ducks,the body weight,neck length,shank length,shank circumference and semi-diving length had the highest contribution to principal components,and the contribution of body weight,body oblique length and chest depth to principal component 1 was similar.In summary,the body weight,body oblique length,neck length,shank length and shank circumference can be the candidate traits for Cherry valley duck early selection and breeding.