Swine Gestation Calculator
To use swine gestation calculator, Enter pig’s breeding Date, adjust gestation length, default is 114 days, can be adjusted between 110-118 days.
Enter which litter number this will be for the sow, choose the sow’s breed for customized recommendations.
The calculator will compute the estimated farrowing (due) date.
Swine Gestation Table
| Days | Weeks | Months | Stage |
|---|---|---|---|
| 0 | 0 | 0 | Breeding |
| 7 | 1 | 0.25 | Embryos implant in uterus |
| 14 | 2 | 0.5 | Early pregnancy confirmed |
| 21 | 3 | 0.75 | Organ development begins |
| 28 | 4 | 1 | Fetuses become visible |
| 35 | 5 | 1.25 | Major organs forming |
| 42 | 6 | 1.5 | Skeletal development |
| 49 | 7 | 1.75 | Rapid growth begins |
| 56 | 8 | 2 | Continued growth |
| 63 | 9 | 2.25 | Piglets begin to resemble pigs |
| 70 | 10 | 2.5 | Hair and skin forming |
| 77 | 11 | 2.75 | Weight gain accelerates |
| 84 | 12 | 3 | Almost fully formed |
| 91 | 13 | 3.25 | Preparing for farrowing |
| 100 | 14 | 3.5 | Piglets fully developed |
| 107 | 15 | 3.75 | Final preparations |
| 114 | 16 | 4 | Farrowing (Birth) |
Key Notes:
- Stages by Trimester:
- First Trimester (Days 0–38): Implantation and early organ development.
- Second Trimester (Days 39–76): Rapid skeletal and tissue development.
- Third Trimester (Days 77–114): Growth acceleration and preparation for birth.
Swine Gestation Formula
Breeding Date + 114 days = Expected Farrowing DateAdjusted Gestation Length Formula:
Adjusted Length = Standard Length + Litter Adjustment + Breed AdjustmentFeed Requirement Formula:
Daily Feed = Base Amount × Breed Factor × Litter FactorHow to Calculate Gestation Period
To accurately calculate swine gestation, follow these steps:
- Record the breeding date precisely
- Add 114 days to determine the farrowing date
- Mark key checkpoints at days 30 (pregnancy check), 60 (nutrition adjustment), and 100 (farrowing preparation)
If your sow was bred on September 1st, your calculation would be:
September 1 + 114 days = December 24th expected farrowingWhat is a Typical Gestation Timeline?
For a standard sow, typical gestation milestones include:
- Early Gestation: Days 1-30, Feed Requirements: 4-5 lbs/day
- Mid Gestation: Days 31-90, Feed Requirements: 5-6 lbs/day
- Late Gestation: Days 91-114, Feed Requirements: 6-8 lbs/day
- Farrowing Prep: Days 109-114, Special Care: Increased monitoring
- Movement Schedule: Day 109, Action: Move to farrowing house
What is Pig Gestation?
Pig gestation refers to the pregnancy period of a female pig (sow), starting from successful breeding until farrowing. This crucial period lasts approximately 114 days, or roughly 3 months, 3 weeks, and 3 days. During this time, the sow undergoes significant physiological changes to support the developing piglets.