Graduate School of Agricultural Science, Tohoku University, Sendai, Japan.
Faculty of Agriculture, Tohoku University, Sendai, Japan.
Anim Sci J. 2019 Sep;90(9):1111-1119. doi: 10.1111/asj.13252. Epub 2019 Jul 3.
We estimated genetic parameters for number born alive (NBA) from the first to the seventh parities in Landrace and Large White pigs using three models. Analyzing 55,160 farrowing records for 12,677 Landrace dams and 43,839 for 10,405 Large White dams, we used a single-trait animal model to estimate the heritability of NBA at each parity and a two-trait animal model and a single-trait random regression model to estimate the genetic correlations between parities. Heritability estimates of NBA at each parity ranged from 0.08 to 0.13 for Landrace and from 0.05 to 0.16 for Large White. Estimated genetic correlations between parities in all cases were positive. Genetic correlations between the first and second parities were slightly lower than those between other neighboring parities. Genetic correlations between more distant parities tended to be lower, in some cases <0.8. The results indicate the necessity to investigate the applicability of evaluating NBA at different parities as different traits (e.g., the first and later parities), although a repeatability model might still be reasonable.
我们使用三种模型估计了长白猪和大白猪从第一到第七胎的活产仔数（NBA）的遗传参数。通过分析 12677 头长白母猪和 10405 头大白母猪的 55160 个产仔记录，我们使用单性状动物模型估计了每个胎次的 NBA 遗传力，并使用双性状动物模型和单性状随机回归模型估计了胎次之间的遗传相关性。长白猪 NBA 的各胎次遗传力估计值在 0.08 到 0.13 之间，大白猪在 0.05 到 0.16 之间。在所有情况下，各胎次之间的遗传相关性均为正。第一胎和第二胎之间的遗传相关性略低于其他相邻胎次之间的遗传相关性。更远的胎次之间的遗传相关性往往较低，在某些情况下<0.8。结果表明，尽管重复模型可能仍然合理，但有必要研究在不同胎次评估 NBA 的适用性作为不同的性状（例如，第一胎和以后的胎次）。
