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Gestation length on a beef cow is another one of those numbers where the average is seldom seen. The gestation length for all breeds of cattle averaged together is 283 days. The range is 279 for Jersey and up to 292 for Brahman.On the average, the Continental breeds of Charolais, Simmental and Limousin exhibit gesta-tion lengths of 289 days.wenty-three percent were born be-tween 279 and 283 days of gestation, while only 13% were born between 284 and 291 days of gestation. The average gestation length on all 140 of these calves was 279 days, four days less than the 283 breed average.
The gestation period for a cow is about nine months long. A newborn calf's size can vary among breeds, but a typical calf typically weighs 25 to 45 kg (55 to 99 lb). Adult size and weight vary significantly among breeds and sex.attle were originally identified as three separate species: Bos taurus, the European or taurine cattle (including similar types from Africa and Asia); Bos indicus, the zebu; and the extinct Bos primigenius, the aurochs. The aurochs is ancestral to both zebu and taurine cattle.