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Sow Gestation & Farrowing Date Calculator

Calculate expected farrowing date from breeding date. Track milestones, export calendar reminders, and plan your farrowing house prep.

SwineGestationCalendar Export
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Breeding Information

Add or subtract days from the standard 114-day gestation

  • Planning breeding cycles for sow herds
  • Scheduling farrowing crate preparation
  • Setting up vaccination and nutrition milestones
  • Exporting gestation timelines to farm calendars
  • Training new farrowing house staff on expected timelines

Don't use for

  • As a substitute for veterinary pregnancy confirmation
  • For species other than domestic swine (gestation varies by species)

Swine Gestation Biology

The domestic pig (*Sus scrofa domesticus*) has a gestation period of 114 days (approximately 3 months, 3 weeks, and 3 days). This is remarkably consistent across all commercial breeds — Yorkshire, Duroc, Hampshire, Berkshire, and crossbreeds.

Key gestational stages: - Days 1–12: Embryo development and implantation - Days 13–35: Organogenesis — critical period for fetal development - Days 35–90: Rapid fetal growth — skeletal and organ maturation - Days 90–114: Final growth phase — piglets gain 50% of birth weight in the last 3 weeks

Proper nutrition during late gestation (day 90+) directly impacts piglet birth weight and colostrum quality. Sows should transition to lactation-level feed during this period.

Farrowing Management Best Practices

Successful farrowing management depends on preparation and monitoring:

Pre-farrowing (Day 107–112): - Clean and disinfect farrowing crate before sow entry - Set heat lamp or mat to maintain piglet zone at 86–90°F (30–32°C) for the first week - Stock iron dextran (150–200 mg IM for piglets), ear tags, and processing supplies - Ensure adequate colostrum management plan (all piglets within 6 hours)
During farrowing: - Average farrowing duration: 2–5 hours for the complete litter - Interval between piglets: typically 15–20 minutes - Intervene if no piglet delivered for >45 minutes - Dry piglets and place under heat source immediately
Post-farrowing (first 72 hours): - Monitor sow for appetite return and milk production - Process piglets (iron injection, teeth clipping, tail docking, ear notching) within 24–72 hours - Watch for crushing — highest risk in first 3 days

Frequently Asked Questions

Next Steps

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