Wiktionary
n. (context physiology English) The repeating physiological changes that are influenced by hormones controlling reproduction in placental mammals other than human beings and greater apes.
Wikipedia
The estrous cycle (also oestrus cycle; derived from Latin oestrus and originally from Greek οἶστρος meaning sexual desire) comprises the recurring physiologic changes that are induced by reproductive hormones in most mammalian therian females. Estrous cycles start after sexual maturity in females and are interrupted by anestrous phases or pregnancies. Typically, estrous cycles continue until death. Some animals may display bloody vaginal discharge, often mistaken for menstruation, also called a "period".
Usage examples of "estrous cycle".
Since coitus takes place only during the period of fertility, the chance of conception is high, as with all mammals that have an estrous cycle.
Seemed like years, waiting three weeks at a time for some bureaucrat to get over her estrous cycle so we could get an appointment.