Swine Gestation Calculator
Calculate pig farrowing due date and monitor sow pregnancy with 114-day gestation timeline
Calculate Pig Farrowing Date
Enter successful mating date
Leave blank to use today's date
Select your pig's breed
Example Calculation
Typical Swine Gestation Example
Pig breed: Yorkshire Sow
Breeding date: January 1, 2025
Gestation period: 114 days (≈3 months, 3 weeks, 2 days)
Expected farrowing date: April 25, 2025
Farrowing window: April 23 - April 29, 2025
Expected litter: 10-14 piglets
Calculation
Farrowing Date = Breeding Date + 114 days
Farrowing Date = January 1 + 114 days
Farrowing Date = April 25, 2025
Range: 112-120 days for most breeds
Earliest Farrowing: April 23, 2025 (112 days)
Latest Farrowing: May 1, 2025 (120 days)
Signs of Approaching Farrowing
Udder Development
2-3 days before
Udder becomes swollen and firm
Behavioral Changes
1-2 days before
Restlessness, nesting behavior
Physical Signs
Hours before
Vulva swelling, milk discharge
Farrowing Preparation
Prepare clean, warm farrowing pen
Increase feed in last 4 weeks
Install heat lamps for piglets
Monitor sow behavior closely
Have veterinarian contact ready
Swine Breeding Facts
Heat Cycle
Every 18-24 days, receptive 24-72 hours
Sexual Maturity
3-12 months old, 230+ days recommended
Typical Litter
8-12 piglets, up to 20 possible
Understanding Swine Gestation & Farrowing
Swine Gestation Period
The gestation period of pigs is typically 114 days (about 3 months, 3 weeks, and 2 days), ranging from 112-120 days depending on breed, nutrition, and environmental factors. This consistent timeline allows for predictable farrowing schedules in commercial operations.
What is Farrowing?
- •Farrowing is the process of a sow giving birth to piglets
- •Labor typically lasts 2-8 hours for normal births
- •Sows usually give birth to 8-12 piglets per litter
- •Piglets are born approximately every 15-20 minutes
Calculation Formula
Farrowing Date = Breeding Date + 114 Days
- Average Gestation: 114 days (≈3 months, 3 weeks, 2 days)
- Normal Range: 112-120 days
- Breed Variations: ±2-3 days from average
- Environmental Factors: Nutrition, stress, temperature
Farrowing Management
Successful farrowing requires proper nutrition during pregnancy, adequate housing with farrowing crates or pens, and close monitoring during the final week. Sows can breed twice yearly due to the short gestation period.
Management Tip: Pigs can breed year-round and reach sexual maturity early, but proper nutrition and housing are essential for successful farrowing.