Effect of lameness on sow longevity
Effect of lameness on sow longevity
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DOI：
10.2460/javma.235.6.734
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发表时间：
2009-09-15
影响因子：
1.9
通讯作者：
Deen, John
中科院分区：
文献类型：
--
作者：
Anil, Sukumarannair S.;Anil, Leena;Deen, John
目的：通过时间-事件分析，分析跛行与生产性能变量对母猪寿命的影响。设计-队列研究。动物-674头母猪，来自商业养殖群体。关于分娩性能和寿命的数据是在2005年和2006年期间从猪群数据库中收集的3胎或更少胎母猪的产仔性能和寿命数据。用Cox回归分析危险因素与母猪跛行评估后350天内母猪寿命的关系。结果断奶前仔猪死亡数、死胎猪数、木乃伊猪数与跛行后350天母猪寿命呈负相关。活着出生的猪的数量越多，母猪的胎次越小，就越有保护作用。跛行母猪在跛行评估后的350d内被赶出猪群的风险更高(1.710倍)。跛行母猪的日产活仔数、350天母猪存活率和群体总天数均低于非跛行母猪。结论和临床相关性--本研究结果表明，在商品猪群中，跛行母猪和非跛行母猪的存活率存在显著差异。胎次和产仔性能变量是影响该群母猪寿命的因素。生产者需要将母猪跛行降至最低，并及早(当不能进行治疗时)将跛行母猪从猪群中移除，以将经济损失降至最低。(兽医协会杂志2009；235：734-738)
Objective-To analyze the association of lameness and performance variables on sow longevity by use of time-to-event analysis.Design-Cohort study.Animals-674 sows from a commercial breeding herd.Procedures-A lameness assessment was performed on each sow. Data on farrowing performance and longevity were collected for the sows during 3 or fewer parities from the database of the herd during 2005 and 2006. The association of risk factors with sow longevity within 350 days after lameness assessment was analyzed via Cox regression analysis. Pigs per day, total production days, and survival at 350 days after lameness evaluation were compared between lame and nonlame sows.Results-Numbers of preweaning baby pig deaths, stillborn pigs, and mummified pigs were negatively associated with sow longevity within 350 days after lameness assessment. A higher number of pigs born alive and younger parity of sows were protective. Lame sows had a higher risk (1.710 times as high) of removal from the herd within 350 days after lameness assessment. The number of pigs born alive per day, survival of sows at 350 days, and total number of days in the herd were lower in lame sows.Conclusions and Clinical Relevance-Results of this study indicated significant differences in the survivability of lame and nonlame sows in a commercial herd. Parity and farrowing performance variables were factors influencing sow longevity in this herd. Producers need to minimize sow lameness and remove lame sows from a herd early (when treatment is not an option) to minimize economic loss. (J Am Vet Med Assoc 2009;235:734-738)