I've a gilt who was served on 25th of November and by my reckoning will be due 21st of March.
I usually count 16 weeks and allow a few days either side

If you've not seen signs of season or the boar being 'interested' then it's perfectly possible they're in pig - or it could just be that you've missed it.
The one that was in with the boar to start with could be due at the start of March, providing she was in season when she went in and he caught her on that cycle - but otherwise it could just be a bit of a wait & guessing game. The udder should start to develop from a month before she's due and once you see a puffy vulva you're generally inside a week, milk spurting from her teats means get the heat light on cos it'll be less than 24 hours before the piglets make their arrival. But pigs have a habbit of surprising you

HTH
Karen
