Average gestation length for cattle is often reported as 283 days with a common range of about 9 days either side of the average. When getting ready for the start of calving season be aware that gestation length varies depending on breed, genetics differences within a breed, calf sex, age of dam, and other factors.

The average gestation length for Angus is about 279 days compared with 291 for Brahman. Gestation length is longer for bull calves. Gestation length is often shorter for low birth weight genetics, so be prepared for those heifers to calve early. ~Jason Banta