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Swine Gestation

Calculate pig farrowing (birth) date with comprehensive gestation tracking. Average gestation: 114 days (3 months, 3 weeks, 3 days). Range: 112-120 days. Works for all pig types including domestic,...

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ANIMAL REPRODUCTION

Swine Gestation Calculator — Farrowing Date

114 days (3-3-3). Range 112–120. All pig types same.

🐷 Commercial Sow - Large Operation
Mature sow, 4th litter (largest expected)
🐽 Potbellied Pig - Pet Breeding
Pet potbellied pig, first pregnancy
🐷 Mini Pig - Companion Animal
Mini pig companion, second litter
🐖 Heritage Breed (Berkshire)
Heritage breed, 5th litter

📥 Inputs

Date when the sow was bred
All types have same 114-day gestation
Affects expected litter size
Number of previous litters (0 = first pregnancy)

For educational use only. Always confirm dosages and care with a licensed veterinarian.

📋 Key Takeaways

  • 114 days avg (112–120). Memory: 3 months, 3 weeks, 3 days.
  • All pig types same gestation: domestic, mini, potbellied.
  • Before day 109 = abortion. Days 109–112 = premature.
  • • 4th litter largest (12–14 piglets). First litter smaller (8–10).

💡 Did You Know?

3-3-3 rule

90 + 21 + 3 = 114 days. Easy memory aid.

Size irrelevant

Mini and potbellied same 114 days as commercial.

Year-round

Pigs breed any season. No specific breeding season.

Heat cycle

18–24 days. >24 days no heat = likely pregnant.

4th litter peak

Parity 3 typically largest. Then gradual decline.

Day 109 threshold

Before = abortion. 109–112 = premature.

📖 How Farrowing Date Works

Farrowing = breeding + 114 days. Litter size by parity. Before day 109 = abortion.

Farrowing = Breeding + 114 days | Range: 112–120 | 3-3-3 = 90+21+3

🎯 Expert Tips

Monitor day 110

Farrowing pens ready. Check multiple times daily.

Nesting behavior

Restless, gathering bedding = near farrowing.

First-time gilts

Smaller litters (8–10). May lamb slightly later.

Breed at 6–8 mo

Wait for adequate body weight before breeding.

⚖️ Gestation Stages

StageDaysKey Events
Breeding0Conception
Implantation10Embryos implant
Pregnancy confirm21Ultrasound possible
Abortion threshold109Before = abortion
Earliest farrowing112Start of normal range
Expected farrowing1143-3-3 average
Latest farrowing120End of normal range

❓ FAQ

Do mini/potbellied pigs have different gestation?

No. All pigs: 114 days. Size doesn't affect gestation.

Abortion vs premature?

Before day 109 = abortion. Days 109–112 = premature. 112–120 = normal.

When can pigs first breed?

3–12 months. Recommend 6–8 months, adequate weight.

Heat cycle?

18–24 days. Male+female >24 days no heat = likely pregnant.

Largest litter?

4th litter (parity 3). 12–14+ piglets. First: 8–10.

Breed year-round?

Yes. No specific season.

📊 Stats

114
days avg
112–120
normal range
8–14
piglets typical
18–24
day heat cycle

📚 Sources

  • • USDA, extension services
  • • National Pork Board
  • • Livestock veterinary references

⚠️ Disclaimer

Estimates only. Not veterinary advice. Consult vet for breeding management.

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