"3 months, 3 weeks, 3 days" = 114 days average
Pig gestation is remembered as "3 months, 3 weeks, and 3 days" = 114 days (range 111-117). Sows cycle every 21 days with estrus lasting 2-3 days. Average litter: 10-14 piglets for commercial breeds. Pregnancy detection: no return to heat at 21 days, ultrasound at 25+ days, or Doppler at 30+ days. Move the sow to a clean farrowing area on day 110. Sows need increased feed (4-6 lbs/day) in the last 3 weeks. Signs of imminent farrowing: restlessness, nesting, milk from teats (6-12 hours before), and temperature drop. Average farrowing takes 3-5 hours with piglets born every 15-20 minutes. Ensure piglets nurse colostrum within 6 hours for antibody transfer.