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Donkey Gestation Calculator

Estimate a jenny's foaling date at 365 days after breeding, with a 335 to 395 day planning window.

Estimation Method

Donkey gestation at a glance

Average used by this calculator365 days (about 12 months)
Window shown by this calculator335 to 395 days after breeding
Due date formulaBreeding date + 365 days
Birth is calledFoaling
Reported range11 to 14.5 months in the Donkey Sanctuary guide
NewbornFoal

Merck lists donkey gestation at 365 days. Studies by Galisteo and Perez-Marin and by Nervo and colleagues report averages near one year, while Carluccio and colleagues observed 335 to 395 days in Martina Franca jennies. We use 335 to 395 days as a planning window, not a normal limit. The Donkey Sanctuary reports a broader range of about 11 to 14.5 months. Agree foaling monitoring and timing with your veterinarian.

Donkey foaling timeline

Last month, often about 3 weeks before birthThe udder may gradually enlarge and begin producing milk.
Several days before birthThe teats may enlarge.
24 to 48 hours before birthWaxing may appear on the teats.
Near foalingThe pelvic ligaments may soften and the vulva may lengthen.

Frequently asked questions

How long is a donkey pregnant?

The calculator estimates 365 days, about 12 months, with a 335 to 395 day Foaling Planning Window. Individual gestations vary: the Donkey Sanctuary reports about 11 to 14.5 months. The window is for planning, not a clinical normal limit.

How do I calculate a donkey foaling date?

Enter the breeding date to see an estimated foaling date at day 365 and a planning window from days 335 to 395. Agree monitoring and timing with your veterinarian rather than using the window alone to decide whether it is safe to wait.

What signs show a jenny is close to foaling?

A jenny may show an enlarging udder, larger teats, softened pelvic ligaments, a longer vulva and restlessness before foaling.

When should I call a veterinarian during donkey foaling?

Aronoff, in Veterinary Care of Donkeys, says a jenny straining hard for 20 to 30 minutes with no foal appearing needs assistance; call your veterinarian.

Sources

Reviewed by Elliott Garber, DVM · Last reviewed