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    影响母猪断奶至配种间隔的遗传参数估计

    Estimation of genetic parameters affecting the weaning-to-service interval in sows

      摘要
    • 摘要:
      目的  分析影响母猪断奶至配种间隔的因素，并估计母猪断奶至配种间隔的遗传参数，为猪场育种规划提供理论参考。
      方法  本研究材料为2011—2016年间采集的华南地区2个场区(A场和B场)大白母猪和长白母猪的繁殖记录。采用Duncan’s法对影响母猪断奶至配种间隔的因素进行显著性分析，并使用DMU软件的AI-REML结合EM算法进行遗传参数估计。
      结果  分娩胎次和断奶年份对母猪断奶至配种间隔影响均极显著(P<0.01)；断奶季节对A、B 2个场区长白母猪及B场大白母猪的断奶至配种间隔影响均极显著(P<0.01)，而对A场大白母猪的断奶至配种间隔影响不显著(P>0.05)；带仔数对A、B 2个场区的母猪断奶至配种间隔影响均不显著(P>0.05)。A场大白和长白母猪的断奶至配种间隔遗传力分别为0.02和0.04，B场大白和长白母猪断奶至配种间隔的遗传力均为0.06。
      结论  华南地区母猪断奶至配种间隔为低遗传力性状，受分娩胎次与断奶季节的影响显著。在实际生产中应缩短母猪初产后断奶至配种间隔，并尽可能使母猪在冷季断奶。

       

      Abstract:
      Objective  To analyze the factors affecting weaning-to-service interval(WSI) of sows, estimate genetic parameters of WSI in sows, and provide theoretical references for pig breeding program.
      Method  The research data are the reproductive records of Yorkshire and Landrace in two farms (A and B) of South China collected from 2011 to 2016. Duncan’ s method was used to analyze the factors affecting WSI of sows. The genetic parameters were estimated using AI-REML of DMU software combined with EM algorithm.
      Result  Parity and weaning years had highly significant effects on WSI of sows (P<0.01). Weaning season had highly significant effect on WSI of Landrace sows in both A and B farms and Yorkshire sows in B farm (P<0.01), while it had no significant effect on WSI of Yorkshire sows in A farm (P>0.05). The number of suckling piglets had no significant effect on WSI of sows in both farms (P>0.05). The heritabilities of WSI in Yorkshire and Landrace sows in A farm were 0.02 and 0.04 respectively, and the heritabilities of WSI in both Yorkshire and Landrace sows in B farm were 0.06.
      Conclusion  The WSI of sows in South China is a low heritability trait, which is significantly affected by parity and weaning season. In practical production, the WSI of sows after first delivery should be shortened, and the sows should be weaned in cold season.

       

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