Work out gestation period (animals) instantly with clear inputs, formula shown and shareable results.
Adds the species-typical gestation length to the breeding date and shows a one-week window either side.
Gestation lengths
Cow 283 days, mare 340, sow 114, ewe 147, goat 150, dog 63, cat 65, measured from service or ovulation
Usually within a few days for pigs and dogs, but mares commonly vary by two to three weeks.
Yes. Large litters tend to shorten gestation slightly in pigs and dogs.