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The gestation (pregnancy) period of the female pig is 114 days. She will be ready to be bred another time around 5-7 days after her pigs are weaned (removed from nursing). Thus if you wean the litter of pigs at 21 days of age she will come into estrus (heat) around 26-28 days after farrowing (giving birth).
Gilbert Hollis Extension Swine Specialist Department of Animal Sciences University of Illinois
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