产仔季节对长大二元杂种母猪产仔性能的影响

Effects of Farrowing Season on the Farrowing Performance of Landrace ×Yorkshire Hybrid Sows

[目的]最大限度地发挥长大二元杂交母猪的繁殖潜力,实现经济效益。[方法]根据安徽某商业猪场2008年母猪正常分娩记录,分析了季节因素(月份)对长大母猪窝产仔数、窝健仔数、窝畸形数、窝弱仔数、窝死胎数和窝木乃伊数影响。[结果]3月窝产仔数及窝健仔数达全年最高位,分别为12.08和10.76头;7—9月则低于年平均值,8月份最低,分别为11.53头和9.84头。窝畸形数以6—8月较高,8月份最高,达0.38头;7—10月窝弱仔数和窝死胎数均较高,10月份达全年最高,分别为1.06头和0.48头;6—9月份窝木乃伊数较高,9月份最高,达0.23头。[结论]产仔季节(月份)对长大母猪窝产仔数、窝健仔数、窝畸形数、窝弱仔数、窝死胎数和窝木乃伊数均有显著影响,其中7—9月高温季节对上述繁殖性状的影响较大。

Objective The research aimed to play the reproductive potential of Landrace ×Yorkshire hybrid sows furthest and achieve the economic benefits. [Method]Based on the farrowing records of sows in a commercial pig farm in 2008, the effects of seasonal factors （months） on the litter size, the number of healthy piglets per litter, the number of deformed piglets per litter, the number of weak piglets per litter, stillbirth number per litter and the number of mummies per litter of Landrace ×Yorkshire hybrid sows were analyzed. [Result]The litter size and the number of healthy piglets per litter in March reached the highest values in the whole year, being 12.08 and 10.76 respectively. The litter size and the number of healthy piglets per litter from July to September were lower than the annual average values, and that in August were the lowest（being 11.53 and 9.84 respectively）. The number of deformed piglets per litter from June to August was high-er, and that in August was the highest （0.38）. The number of weak piglets per litter and stillbirth number per litter from August to October were higher, and that in October reached the highest values （being 1.06 and 0.48 respectively）. The number of mummies per litter from June to September were higher, and that in September was the highest （0.23）. [Conclusion]The farrowing season（month） had significant effects on the litter size,the number of healthy piglets per litter, the number of deformed piglets per litter, the number of weak piglets per litter, stillbirth number per litter and the number of mummies per litter of Landrace ×Yorkshire hybrid sows. Hightemperature season （from July to September） had greater effects on the above reproductive traits.