Effect of lameness on sow longevity

Journal of the American Veterinary Medical Association - Tập 235 Số 6 - Trang 734-738 - 2009
Sukumarannair Anil1, Leena Anil2, John Deen3
1Department of Veterinary Population Medicine; College of Veterinary Medicine; University of Minnesota; Saint Paul MN 55108 USA
2University of Minnesota Twin Cities
3Veterinary Population Medicine

Tóm tắt

Abstract

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.

Từ khóa


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Thông tin xuất bản

Journal of the American Veterinary Medical Association

Tập 235 Số 6

734-738

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