松辽黑猪繁殖性状的相关及通径分析

Correlation and Path Analysis for Reproductive Traits of Songliao Black Swine

对松辽黑猪总产仔数(x1)、产活仔数(x2)、出生均重(x3)、出生窝重(x4)、20日龄窝重(x5)、断奶仔猪数(x6)、35日龄断奶窝重(y)7个繁殖性状进行了通径分析和回归分析。结果表明各个繁殖性状在表型值上都存在不同程度的相关,其中对断奶窝重影响最大的为断奶仔猪数,其次为20日龄窝重、产活仔数及总产仔数。建立最优回归方程为y=20.031–1.958x1+0.405x5+8.

Seven reproductive traits including total number of farrowed piglets（x1）, number of living newborn piglets（x2）, average weight of newborn piglets（x3）, litter weight of newborn piglets（x4）, litter weight of 20-day old piglets（x5）, number of weaned piglets（x6） and litter weight of 35-day old weaned piglets（y） of Songliao black pig were analyzed with Path analysis and regression analysis. The results shows that a major portion of reproductive traits were correlated with another, and the most factor influenced on the litter weight of 35-day old weaned piglets was the number of weaned piglets ,and secondly were the litter weight of 20-day old piglets, number of weaned piglets and number of living newborn piglets .The optimum regression equation of reproductive traits, y=20.031-1.958xt＋0.405xs＋8.201 x6,was established in Songliao black swine.