不同生长阶段长白猪体型特征的主成分分析

体型特征参数是了解不同生长阶段猪的生长发育情况,开展猪的育种和养猪设施、设备等工程配套技术研究的重要参考参数。选取4个不同生长阶段长白猪的6个体型特征参数进行了主成分分析,结果表明:不同阶段长白猪各体型特征参数之间均呈现显著的正相关(P<0.01),其中以胸围与体重的相关性最为明显。不同日龄猪的主成分因子有所不同,1日龄的第一主成分为长度因子,第二主成分为高度因子;28日龄、70日龄和150日龄的第一主成分为宽度因子,第二主成分为长度因子;1日龄和70日龄的第三主成分为长度因子,28日龄和150日龄的为高度因子。不同生长阶段长白猪在长、宽、高方向的生长速率存在一定差异。

Principal component analysis of Landrace's physical characteristics

The physical characteristic is one of the most important signs of a pig growth and the study of the physical characteristic has an important reference significance for understanding of a pig growth at the different stages.Landraces used in this research are all from a certain intensive farming system in Tianjin the relationships among body weight,body length,oblique length,withers height,chest circumference,and abdominal perimeter variables were investigated and the principal component from the four stages,1-day-old,28-days-old,70-days-old and 150-days-old of Landraces,were analyzed.The result shows that the physical characteristics of the Landraces at different ages have notable correlation(P<0.01),especially the relationship between chest circumference and body weight.The PCs are different at different stages.When the Landraces are 1 day old,the length factor is the PC1,the height factor is the PC2;When the Landraces are 28,70 and 150 days old,the breadth factor is the PC1,the length factor is the PC2;when the Landraces are 1 and 70 days old,the length factor is the PC3,when the Landraces are 28 and 150 days old,the height factor is the PC3.