Gestation & incubation calendar
Choose a species and the day the female was served (or the eggs were set) to get an expected due or hatch date — and the window to keep an eye on.
Expected due date
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At a glance
| Species | Type | Days |
|---|---|---|
| Cow (cattle) | Gestation | 283 |
| Ewe (sheep) | Gestation | 147 |
| Nanny goat | Gestation | 150 |
| Sow (pig) | Gestation | 114 |
| Mare (horse) | Gestation | 340 |
| Alpaca | Gestation | 342 |
| Rabbit | Gestation | 31 |
| Chicken eggs | Incubation | 21 |
| Duck eggs (Pekin & most breeds) | Incubation | 28 |
| Goose eggs | Incubation | 30 |
| Turkey eggs | Incubation | 28 |
| Quail eggs (Japanese) | Incubation | 17 |
These are averages. Breed, litter size and conditions all move the date, so treat it as a planning aid and talk to your vet about anything that looks late or difficult.