Abstract: 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.

Key words: outbred Wuzhishan mini-pigs; productive performance; path analysis; multiple regression analysis