Adjective
(of lower mammals) showing or in a state of estrus; in heat
Source: WordNetthe estrous state Source: Internet
the estrous cycle Source: Internet
Although some squabbling may occur among the males, once the female has selected a mate and copulates, the rejected males do not intervene, and move on once they detect other estrous females. Source: Internet
Birth and parenting With the exception of the walrus, which has five- to six-year-long inter-birth intervals, female pinnipeds enter estrous shortly after they give birth. Source: Internet
In captivity, estrous cycles recur every 15 days. Source: Internet
Effects on the reproductive system during the estrous cycle Changes in hormone levels can have great effects on the physical characteristics of the reproductive organs of the mare, thereby preparing, or preventing, her from conceiving. Source: Internet