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首页> 外文期刊>Canadian Journal of Animal Science >Relationships between backfat thickness and reproductive efficiency of sows: a two-year trial involving two commercial herds fixing backfat thickness at breeding.
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Relationships between backfat thickness and reproductive efficiency of sows: a two-year trial involving two commercial herds fixing backfat thickness at breeding.

机译：后脂肪厚度与母猪繁殖效率之间的关系：一项为期两年的试验，涉及两个商业牛群在繁殖时固定后脂肪厚度。

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摘要

In this study, we established whether controlling backfat thickness at breeding over a long time period can result in optimized reproductive performance in sows. Two commercial herds were used: herd A (322 purebred Landrace sows) and herd B (337 cross-bred Yorkshire-Landrace sows). Backfat thickness at breeding and farrowing, along with reproductive data [live Born (LB), stillborn, mummified, piglets alive at 48 h (LB48) and the weaning-to-estrus interval (WEI)] were collected over nine parities. The herd B producer was more successful in maintaining a steady backfat thickness at breeding than was the herd A producer. At breeding, the backfat thickness of sows fromherd A showed a marked decrease between parities 2 and 5. During their first parity, these sows gained the least backfat during gestation and lost the most backfat during lactation. Sows from herd B had more LB and LB48 than sows from herd A. In herd A, a longer WEI was found in first and second parity sows. Our results demonstrate that maintaining backfat thickness throughout the reproductive cycle is more important than fixing this parameter at breeding alone. This is particularly true for gilts, which are prone to mobilize fat tissue reserves, a condition associated with declining reproductive performance.
机译：在这项研究中，我们确定了长期控制繁殖时的背脂厚度是否可以优化母猪的繁殖性能。使用了两种商品群：群A（322头纯种长白母猪）和群B（337杂交的约克夏-兰德斯母猪）。在九个胎龄中收集了繁殖和分娩时的背脂肪厚度以及生殖数据[活产（LB），死胎，木乃伊，在48 h存活的仔猪（LB48）和断奶至发情间隔（WEI）]。牛群B生产者比牛群A生产者在维持稳定的后脂肪厚度方面更成功。在繁殖过程中，A群母猪的后脂肪厚度在第2和第5胎之间显着下降。在第一个胎次期间，这些母猪在妊娠期获得的后脂肪最少，而在泌乳期损失的则最多。牛群B中的母猪比牛群A中的母猪具有更多的LB和LB48。在牛群A中，第一胎和第二胎的平均WEI更长。我们的结果表明，在整个繁殖周期中保持背脂厚度比仅在繁殖时固定该参数更为重要。对于易于调动脂肪组织储备的后备母猪尤其如此，这是与生殖能力下降有关的疾病。

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