Shen Jun-Ye, Yu Ying, Wang Xi, Ma Pei-Pei, Zhu Shi-En, Shi Wen-Qing, Wang Ya-Chun, Zhang Qin
College of Animal Science and Technology, China Agricultural University, Beijing 100193, China.
Yi Chuan. 2012 May;34(5):591-6. doi: 10.3724/sp.j.1005.2012.00591.
Reproductive performance of stock sows is one of the important factors of economic impact in pig farms. In this study, 8491 litter records from 2699 sows of Yorkshire, Landrace, and Duroc were analyzed using fixed model to determine the effect of parity, mating season, and breed on total number born (TNB), number healthy birth (NHB), litter birth weight (LWB), number weak birth (NWB), stillbirth, mummy fetus, and deform fetus by the least square analysis. Genetic parameters of the above traits were estimated by restricted maximum likelihood (REML) procedure. In addition, the effectiveness of pure-breeding and cross-breeding on litter performance were compared. The results showed that, parity, mating season, and breed had significant effect on TNB, NHB, and LWB(P < 0.001).The effects of parity and breed were significant on NWB(P < 0.001), while mating season had non-significant effect on NWB. Parity showed significant effect on stillbirth, while the effect of mating season and breed was not significant. Parity, mating season, and breed had no significant effect on mummy fetus and deform fetus. Landrace♂×Large White♀ showed the best litter performance, including TNB, NHB, and LWB. Moreover, LWB of Landrace depicted the highest heritability, while other traits were all bellow 0.2. The genetic correlation between TNB and NHB, NHB and LWB were higher than 0.96 in the three breeds. These results provided reference data for minimizing low-reproductive performance caused by non-infectious factors and improving sow reproductive performance in pig farms.
母猪的繁殖性能是养猪场经济影响的重要因素之一。本研究采用固定模型对2699头约克夏、长白和杜洛克母猪的8491窝记录进行分析，通过最小二乘法分析胎次、配种季节和品种对总产仔数（TNB）、健仔数（NHB）、窝出生重（LWB）、弱仔数（NWB）、死胎、木乃伊胎和畸形胎的影响。采用限制最大似然法（REML）估计上述性状的遗传参数。此外，还比较了纯种繁殖和杂交繁殖对窝性能的影响。结果表明，胎次、配种季节和品种对TNB、NHB和LWB有显著影响（P<0.001）。胎次和品种对NWB有显著影响（P<0.001），而配种季节对NWB无显著影响。胎次对死胎有显著影响，而配种季节和品种的影响不显著。胎次、配种季节和品种对木乃伊胎和畸形胎无显著影响。长白♂×大白♀的窝性能最佳，包括TNB、NHB和LWB。此外，长白猪的LWB遗传力最高，而其他性状均低于0.2。三个品种中TNB与NHB、NHB与LWB的遗传相关性均高于0.96。这些结果为减少非传染性因素导致的低繁殖性能和提高养猪场母猪繁殖性能提供了参考数据。
