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During the initial phase tissues protrude from the lips of the vulva when the sow is laying and return to their normal position when the sow stands. In advanced.
Estrus generally lasts 40 hours in gilts and 55 hours in sows, but variation of the signs of estrus that follow reference the numbered images in table 1. Mucous Discharge – Clear, sticky mucus collects on the vulva of a gilt (4) and sow (5).
gNever inseminate a sow or gilt when not in “standing Sows and gilts exhibit signs of heat in response to a Dark red colour on inside of vulva (picture 4 & 5).
tonight and took a picture of her vulva in hopes some of the more if at all as I've read some gilts and sows won't fill up until they farrow.