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Gestation Calculator For Cattle . Choose date of conception or birth and then click the appropriate button for the answer! Select your breeding date and the calculator will automatically give you the average birth date for your livestock option. Gestation Period for Cows Cow Gestation Calculator from animalcare.folio3.com The gestation period (length of pregnancy) for sheep on average is about 5 months or 147 days, however the time for your ewe to give birth does vary based on the breed, environment, litter. Search on google with the keyword beef cattle gestation calculator. Gestation in cows lasts on average 280 days with variations between 279 and 287 days.