6XC

Animal Gestation & Due Date Calculator

Expected birth date from breeding date for cattle, sheep, goats, horses and more — plus incubation for poultry.

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Gestation Lengths That Matter

Average gestations: cow 283 days (roughly 9 months + 10 days), water buffalo 310, mare 340, ewe 152, doe (goat) 150, sow 114 (the classic "3 months, 3 weeks, 3 days"), rabbit 31, dog 63, cat 65. Incubation: chicken 21 days, duck 28, goose 30, turkey 28, quail 17-18. Enter the breeding/AI or setting date and the tool gives the expected date with a ± window.

Real births spread around the average: cattle ±5-7 days is normal, and breed matters (Holstein ~279, Charolais ~287). Plan the dry period and calving pen from the early edge of the window, not the average.

Frequently Asked Questions

Does calf gender or breed change the date?

Both slightly: bull calves run ~1-2 days longer, and beef breeds average a few days more than dairy. The window shown absorbs these shifts.

When should a cow be dried off?

Standard practice is 60 days before expected calving — count back from the early edge of the due window. Shorter dry periods reduce next-lactation yield.

My hen's eggs did not hatch on day 21 — why?

Incubation temperature drives timing: slightly cool runs push hatch to day 22-23; storage age of eggs matters too. A day or two late is common; a week means infertile or failed eggs.

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