Swine Gestation Calculator
Keep track of your sow's pregnancy milestones. Enter the breeding date to see expected farrowing dates and monitor progress.
Date when the sow was bred
How long is pig gestation?
Pig gestation averages 114 days (about 3 months, 3 weeks, 3 days), ranging from 110-120 days. The rule of 3-3-3: 3 months, 3 weeks, 3 days. Most births occur around day 114. Pigs born before day 110 are usually premature and have low survival rates. Overdue sows past day 120 should be monitored closely. First-time gilts (young females) and older sows may have slightly longer pregnancies.
How do I know my sow is ready to farrow?
Signs of approaching farrowing: udder enlargement (7-10 days before), milk when pressed (24-48 hours), vulva swelling/reddening, nesting behavior (shredding bedding), restlessness, loss of appetite, elevated temperature. The sow usually farrows lying on her side. Have your farrowing kit ready. Most births occur at night or early morning. Plan for 2-6 hours of active labor. The first pig should arrive within 1 hour of contractions starting.
What preparations are needed before farrowing?
Prepare 2 weeks before: Clean and disinfect farrowing crate, have heat lamp ready for piglets, gather supplies (iodine, towels, clippers, umbilical clips, colostrum), set up creep area. Sows should enter crate 5-7 days before due date. Ensure adequate nutrition in final trimester (add 1 lb/day of feed). Trim tusks if not done. Have emergency vet contact. Far during warm months if possible - piglets need warmth.
How many piglets do sows typically have?
Average litter size is 6-10 piglets, with first-time gilts on the lower end (6-8). Mature sows average 8-12. Some large breeds can have 12-14. Litter size depends on breed, age, nutrition, and season. Larger litters need extra attention - ensure all piglets get colostrum within 6 hours. Split-nursing may be needed for very large litters. Wean at 3-4 weeks for optimal piglet and sow health.