不同胎次和分娩季节对大白母猪繁殖性能的影响

Effect of different parities and delivery seasons on reproductive performance of Yorkshire sows

本试验选取南安市某规模化猪场191头大白母猪第1胎至第8胎共960窝的繁殖性能数据,分析不同胎次和分娩季节对大白母猪繁殖性能的影响。结果显示:分娩胎次对大白母猪的大部分繁殖性能指标有显著影响(P<0.05),但分娩季节对其影响较小。母猪总产仔数第1胎最少,第6胎最多,而后开始下降;仔猪平均出生重第1胎最低,第2胎达到峰值,第5胎开始锐减;从第2胎开始,死产数量和木乃伊胎数随胎次增加而增加。此外,冬季分娩窝总产仔数和活仔数最高,夏季最低,仔猪平均出生重以秋季为最高。因此,可以认为大白母猪最佳分娩胎次为第3胎至第6胎,最佳分娩季节在冬季和春季。

In this experiment,the production data of 960 litters from the first to eighth fetuses of 191 Yorkshire sows in a large-scale pig farm in Nan'an City were selected.The effects of different parities and delivery seasons on reproductive traits including total number born(TNB),number of born alive(NBA)and birth weight of Yorkshire sows were analyzed.The results showed that the parity of sows had an obvious influences on the most of reproductive performance of Yorkshire sows(P<0.05),however,the delivery season had little influence on them.The TNB was the lowest in the first parity,and the highest in the sixth parity,but began to decline after the sixth parity.The average birth weight of piglets was the lowest in the first parity,reaching the peak in the second parity,and the fifth parity is sharply reduced.From the second parity,the number of stillbirths and mummies increased with the increase of parity.In addition,TNB and NBA was the highest when delivery in winter,while the lowest in summer.In summary,the best delivery time for Yorkshire sows was 3rd to 6th parity,and the appropriate delivery season was spring and winter.