Hot weather may lead to earlier calves

Summertime temperatures shorten gestation length in fall-calving cows and heifers.

Fall calving time is approaching rapidly, with some herds starting sometimes before producers expect.

“Most printed gestation tables predict that calving will take place 283 days — 285 days in some — after artificial insemination or natural breeding,” said Glenn Selk, Oklahoma State University Cooperative Extension emeritus animal scientist. “It is not unusual for cows and heifers that gestate in hot weather to calve a few days earlier.”

Oklahoma State's Division of Agricult

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