封闭群五指山小型猪主要繁殖性状的多重回归与通径分析

试验选取45头普通级封闭群五指山小型猪初产母猪,测定总产仔数(X1)、初生活仔数(X2)、初生窝重(X3)、初生个体重(X4)、21 d活仔数(X5)、21 d窝重(X6)、21 d个体重(X7)、断奶活仔数(X8)、断奶个体重(X9)和断奶窝重(Y)等10个繁殖性状表型值,并对各繁殖性状表型值进行相关、回归及通径分析,以揭示母猪繁殖性状间的真实关系。结果显示,封闭群五指山小型猪的绝大多数繁殖性状的表型值间存在显著正相关,有3对性状间存在较弱负相关。通过多重回归分析建立的估计断奶窝重的多元回归方程为:Y=－4.98690－2.61933X5+1.13628X6－7.55296X7+3.33048X8+6.74545X9,并且形成了三因素水平的性状间因果关系层次。通径分析剖析了相关性状间的直接效应和间接效应,显示X5~X9对断奶窝重有显著性直接影响,表明母猪的泌乳力和营养水平对其繁殖性能有显著影响,先天性繁殖性状对繁殖性能影响较小。

Multiple Regression and Path Coefficient Analysis on Reproductive Traits of Outbred Wuzhishan Mini-pigs

To screen the reproductive traits significantly associated with reproductive performances of outbred Wuzhishan mini-pigs(WZSP), 10 reproductive traits of 45 gilts were determined and analyzed with multiple regression and path coefficient analysis. The traits were as following: total number of piglets born (X1), number born alive (X2), litter weight (X3) and average weight at birth (X4), number alive (X5) and litter weight (X6) and average weight at 21 days (X7), number weaned(X8), weaning average weight (X9) and weight of litter (Y). The results showed that most reproductive traits of outbred WZSP had positive correlations between each other except three pairs of traits showing weak negative correlation. The equation for estimating weaning weight of litter and 10 reproductive traits factor structure of three grades were established by the multiple regression analysis. The equation was Y=－4.98690－2.61933X5+ 1.13628X6－7.55296X7+3.33048X8+6.74545X9. X5 to X9 showed significant direct impacts on weaning weight of litter by path analysis which analyzed the direct and indirect effects of relevant properties. Conclusion can be drawn that sow lactation power and nutrition had significant effect on reproductive performances while the born reproductive traits showed weak correlation with reproductive performances.