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Standing estrus, also referred to as standing heat, is the most visual sign of each estrous cycle. It is the period of time when a female is sex-ually receptive. Estrus in cattle usually lasts about 15 hours but can range from less than 6 hours to close to 24 hours.
A good understanding of the normal estrous cycle in cattle can help producers address reproductive challenges in both heifers and cows.
The basic estrous cycle of the cow averages 21 days in duration (a range of 18 to 24 days) and extends from one period of heat (estrus) to the next. There are four parts to the estrous cycle. Proestrus lasts for one to three days immediately before the cow comes into estrus or heat.
Understanding the biological mechanisms associated with getting a cow or heifer bred can be a significant management tool for increasing realized income. This learning module summarizes the endocrinology and physiology of the bovine (beef cow) estrous cycle.
The estrus cycle of a cow is generally about 21 days long but can span 17-24 days, beginning when the cow reaches its peak estrogen secretion and is “in estrus,” which can last from 6 to 24 hours.
The Estrous Cycle of Cattle The estrous cycle of cattle is the period from one estrus (heat, phase of sexual receptivity) to the next estrus. For the cow and heifer, this period averages 21 days, with a typical range of 18 to 24 days. The reproductive function of a cow or heifer is characterized by whether she displays normal estrous cycles.
The modal length of the estrous cycle is 21 days for mature cows and 20 days for heifers. The cycle is divided into four periods: estrus, metestrus, diestrus, and proestrus