Estrous

adj. of the period of sexual readiness (Zoology)

Oestrus is also the biological genus name of the gadfly. The estrous cycle (also oestrous cycle; originally derived from Latin oestrus) comprises the recurring physiologic changes that are induced by reproductive hormones in most mammalian placental females. Humans undergo a menstrual cycle instead. Estrous cycles start after puberty in sexually mature females and are interrupted by anestrous phases. Typically estrous cycles continue until death. Some animals may display bloody vaginal discharge, often mistaken for menstruation.
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Es·trous adj. Relating to or being in estrus. estrous pertaining to or emanating from estrus. estrous cycle one of the two types of reproductive [more]Estrous - Community and Resources

Adjective
1. (of lower mammals) showing or in a state of estrus; in heat; "the estrous state"; "the estrous cycle"
(antonym) anestrous
(similar) monestrous, monoestrous
(classification) mammal

The female reproductive cycle.