Principal components for the in vivo and carcass conformations of Anglo-Nubian crossbred goats

ABSTRACT: This study aimed to identify the principal components (PC) that explain the highest percentages of total variance and best characterize the in vivo and carcass morphologies of Anglo-Nubian crossbred goats. Nineteen carcass morphometric traits and six in vivo morphometric traits were measured in 28 kids at eight months of age. Principal component analysis indicated that five PC were able to explain 83.57% of the total variance in the 19 original carcass traits. Those components were termed PC1-Carcass Size, PC2 - Body Condition, PC3-Carcass Width, PC4-Chest Depth, and PC5 - Hindquarter. For in vivo morphometric traits, the first two principal components explained 78.86% of the total variance. These components were called PC1-In vivo Size and PC2-In vivo Conformation.摘要：本研究旨在筛选可解释最高总方差占比、且能最优表征英奴比杂交山羊（Anglo-Nubian crossbred goats）活体与胴体形态特征的主成分（Principal Component，PC）。本研究对28只8月龄山羊羔测定了19项胴体形态性状与6项活体形态性状。主成分分析（Principal Component Analysis，PCA）结果显示，5个主成分可解释19项原始胴体性状中83.57%的总方差，将其分别命名为胴体大小主成分（PC1-Carcass Size）、体况主成分（PC2-Body Condition）、胴体宽度主成分（PC3-Carcass Width）、胸深主成分（PC4-Chest Depth）以及后躯主成分（PC5-Hindquarter）。针对活体形态性状，前2个主成分可解释78.86%的总方差，二者分别被命名为活体大小主成分（PC1-In vivo Size）与活体体型结构主成分（PC2-In vivo Conformation）。