Estrous cycle
Ovulation cycle occurring in most mammalian therian females / From Wikipedia, the free encyclopedia
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The estrous cycle (from Latin oestrus 'frenzy', originally from Ancient Greek οἶστρος (oîstros) 'gadfly') is a set of recurring physiological changes induced by reproductive hormones in females of mammalian subclass Theria.[1] Estrous cycles start after sexual maturity in females and are interrupted by anestrous phases, otherwise known as "rest" phases, or by pregnancies. Typically, estrous cycles repeat until death. These cycles are widely variable in duration and frequency depending on the species.[2] Some animals may display bloody vaginal discharge, often mistaken for menstruation.[3] Many mammals used in commercial agriculture, such as cattle and sheep, may have their estrous cycles artificially controlled with hormonal medications for optimum productivity.[4][5] The male equivalent, seen primarily in ruminants, is called rut.[2]