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Bulletin No. 17 - Winter 2003
Miscelleanous- No Category
KNUDSEN N
How to correctly diagnose the causes of reproductive failures.
Swine practitioners, 2003, July/August
BO98420
This paper is based on the presentation made by Michael Yaeger and Kent Schwartz at the Iowa Veterinary Medical Association Winter Conference and relative to cases of reproductive failures in swine. The first approach to reproductive failures is to determine whether the cause is infectious or noninfectious. Porcine reproductive and respiratory syndrome virus (PRRSV) accounted for 87% of all infectious causes of abortion submitted to the Iowa State University, leaving only a small percentage to bacterial agents (7%). However, abortions due to bacteria were in most cases isolated animals within the herd and less than 1% of the cases due to bacteria were herd-wide problems. The best diagnostic approach consists in combining diagnostic testing and review of the herd records to have a comprehensive understanding of the situation. In noninfectious reproductive failures, it is necessary to determine whether the problem comes from conception failure or pregnancy failure in order to implement the more suitable protocol. Nutrition and sow condition were pointed out by the authors as the two major factors affecting return to estrus, conception rates and litter size. On the other hand, mycotoxins in the feed are clearly considered as having no blame in reproductive failures.
