1. What is Mare Gestation Period?

The average gestation period for a mare is approximately 340 days (about 11 months), though normal gestation can range from 320 to 370 days. This calculator provides an estimated due date based on the average.

2. How Does the Calculator Work?

The calculator uses the standard gestation formula:

Where:

• Breeding Date — The date when the mare was bred
• 340 days — Average gestation period for horses

Note: Actual foaling dates may vary by ±20 days from this estimate.

3. Importance of Due Date Calculation

Details: Knowing the estimated due date helps in preparing for foaling, scheduling veterinary checks, and ensuring proper mare nutrition in late pregnancy.

4. Using the Calculator

Tips: Enter the breeding date when the mare was successfully bred. The calculator will add 340 days to estimate the foaling date.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is the 340-day estimate?
A: While 340 days is the average, normal gestation can range from 320-370 days. First-time mares often carry longer.

Q2: What factors affect gestation length?
A: Season (mares bred early in year tend to carry longer), foal gender (colts often carried longer), and mare age.

Q3: When should I start monitoring the mare closely?
A: Begin close observation about 30 days before the estimated due date, as some mares foal early.

Q4: Are there signs of approaching foaling?
A: Yes - udder development, waxing of teats, relaxation of pelvic muscles, and behavioral changes.

Q5: Should I adjust the due date for multiple breedings?
A: Use the last breeding date if unsure which service resulted in pregnancy.