Correlation analysis between the lean meat content and the carcass trait and live body in Guanzhong black pig

摘要

Data for this study were collected from 30 Guanzhong black pigs with a live weight around 90 kg.Assuming the final live weight (x1),body length (x2) ,dressed weight (x3),carcass length (x4),eye area (x5),ham joint weight (x6) and back-fat thickness (x7) to be independent variables and the lean meat weight of carcass (Y) to be a dependent variable for path coefficient analysis,the correlation coefficients,path coefficients,determination coefficients and correlation indices (R2） were calculated.The results indicated that the correlation coefficients between the lean meat weight and respective independent variables were significant;the final live weight (x1 ) and the back-fat thickness (x7) gave predominant direct effect (P Yx1，and PYx7) and determinacy on the lean meat weight(Y ).It is clear from the result of high correlation indices (R2=0.939 8) tha t the path coefficient analysis could reveal the real relationship between the d ependent variable and the independent variables.%选择活重90 kg左右的关中黑猪30头，应用宰前活重、体长、屠宰后的胴体重、胴体长、眼肌面积、腿臀重、背膘厚与胴体瘦肉量资料，计算了相关系数，采用通径分析法计算了以此7个性状为自变量对胴体瘦肉量作依变量的通径系数(PYxi)，决定系数(dYxi)及相关指数(R2)。分析结果表明，7个自变量对胴体瘦肉量的相关系数均呈现极显著或显著；宰前活重和背膘厚对瘦肉量的直接影响(通径系数)和决定程度大，是胴体瘦肉量的最主要的影响因素；选择的7个性状与瘦肉量的相关分析中相关指数(R2=0.939 8)大，通径分析结果能够反映性状间的真实关系。