Average length counted from the breeding date (or the day the eggs are set) and the usual range, from university extension services and the Merck Veterinary Manual. Tap an animal for its calculator and printable table.
Frequently asked questions
Which farm animal has the longest gestation?
Of the animals here, the horse: about 340 days on average (usually 320 to 370). The rabbit has the shortest: about 31 days.
How long do eggs take to hatch?
Chicken 21 days, duck 28, turkey 28, goose about 30, Muscovy duck 35 to 37, Coturnix quail 17 to 18 and bobwhite quail 23.
Where the numbers come from
Merck Veterinary Manual: Approximate Gestation Periods: https://www.merckvetmanual.com/multimedia/table/approximate-gestation-periods
VCA Animal Hospitals: Pregnancy and Parturition in Cats: https://vcahospitals.com/know-your-pet/pregnancy-and-parturition-in-cats
University of Nebraska–Lincoln Beef: Pregnant cows: https://beef.unl.edu/faq/pregnant-cows/
Merck Veterinary Manual: Pregnancy in Goats: https://www.merckvetmanual.com/management-and-nutrition/management-of-reproduction-goats/pregnancy-in-goats
University of Maryland Extension: Sheep 201, the ewe’s reproductive cycle: https://www.sheep101.info/201/ewerepro.html
Penn State Extension: Raising Pigs 1, Farrowing: https://extension.psu.edu/raising-pigs-1-farrowing
Extension Foundation (Horses): Management of the Pregnant Mare: https://horses.extension.org/management-of-the-pregnant-mare/
MSD Veterinary Manual: Management of Rabbits: https://www.msdvetmanual.com/exotic-and-laboratory-animals/rabbits/management-of-rabbits
Texas A&M AgriLife Extension: Incubating and Hatching Eggs (Table 1): https://cdn-de.agrilife.org/extension/departments/posc/posc-pu-018/publications/files/incubating-and-hatching-eggs.pdf
MSD Veterinary Manual: Approximate Incubation Periods: https://www.msdvetmanual.com/multimedia/table/approximate-incubation-periods