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Pig Journal Volume: 48
Publication date: December 2001

Proceedings Section

INSEMINATION OF SOWS AT KNOWN TIME POINTS RELATIVE TO OVULATION
by A. Dawson and A.R. Peters

Abstract
Methods of ultrasonography and their use in sow pregnancy diagnosis are discussed by the authors. Difficulties in predicting an optimum insemination time are related to the variability of oestrus and ovulation. This paper looks at the effect of time interval between AI, or mating, and ovulation on production parameters, including subsequent litter size. Materials and methods are concisely set out. Results confirm that spermatozoa remain viable in the sow?s reproductive tract for at least 50 hours. Further, that the time of AI whether at 50 hours prior to, or 4 hours post-ovulation, had no effect on litter size. Also that AIs closer to ovulation did not lead to greater overall yield of pigs.

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