The objective of this study was to estimate the effect of sire line on sow and piglet performance during lactation. Commercial Landrace x Large White females (n = 60) were bred to one of the following sire lines: a purebred Duroc line (Line S1), a synthetic (Line S2), or purebred Duroc (Line S3) from a different genetic source. Matings were balanced by line and parity. Females were fed a common gestation and lactation diet during these respective phases. Sow and piglet data were analyzed as a completely randomized design using the GLM procedure of SAS. Results show that, during lactation, females bred to line S3 lost significantly (P = 0.01) more BW (-16.93 ± 3.56 kg) than females bred to line S2 (-2.00 ± 3.50 kg). However, no evidence of a difference (P = 0.18) in BW loss was detected between females bred to line S3 (-16.93 ± 3.56 kg) vs. Line S1 (-7.90 ± 3.56 kg). Further, sows bred to line S3 weaned significantly (P = 0.03) more piglets (12.0 ± 0.28) than females bred to line S2 (10.9 ± 0.27), but not (P = 0.1) compared to females bred to line S1 (11.7 ± 0.27). No significant effect of line (P > 0.05) or parity (P > 0.05) on total number of piglet’s born, number born alive, number of stillborn piglets, or preweaning mortality was detected. The number of mummified fetus tended to be lower in line S2 (0.17 vs 0.66; P = 0.079) and line S3 (0.12 vs 0.66; P = 0.051) sows compared with line S1 sows, respectively. In conclusion, sire line did not have a significant effect on total number born, number born alive, number stillborn, or preweaning mortality. However, females bred to line S3 lost significantly more BW during lact but weaned significantly more piglets than females bred to line S2.

中文翻译：

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PSIII-9 父系对哺乳期生殖性能的影响

本研究的目的是评估公牛系对哺乳期母猪和仔猪生产性能的影响。商业长白 x 大白雌性 (n = 60) 与以下父系之一配种：来自不同遗传来源的纯种杜洛克系（系 S1）、合成系（系 S2）或纯种杜洛克系（系 S3）。交配由线和平价平衡。在这些相应的阶段，雌性被喂食普通的妊娠期和哺乳期饮食。使用 SAS 的 GLM 程序将母猪和仔猪数据作为完全随机设计进行分析。结果表明，在哺乳期间，与 S2 系繁殖的雌性相比（-2.00 ± 3.50 kg），与 S3 系繁殖的雌性相比，体重（-16.93 ± 3.56 千克）显着减少（P = 0.01）。然而，在饲养到 S3 系 (-16.93 ± 3.56 kg) 与 线 S1 (-7.90 ± 3.56 公斤)。此外，与 S2 系配种的母猪 (10.9 ± 0.27) 相比，S3 系配种的母猪断奶仔猪数显着 (P = 0.03) (12.0 ± 0.28)，但与 S1 系配种的母猪相比 (P = 0.1) (11.7 ± 0.27)。未检测到品系 (P > 0.05) 或胎次 (P > 0.05) 对仔猪出生总数、活产数、死产仔猪数或断奶前死亡率的显着影响。与 S1 系母猪相比，S2 系（0.17 对 0.66；P = 0.079）和 S3 系（0.12 对 0.66；P = 0.051）母猪的木乃伊胎儿数量往往较低。总之，父系对总出生数、活产数、死产数或断奶前死亡率没有显着影响。然而，