The period of heat when the Queen will mate. A Queen in Oestrus is said to be "On Heat", "On Call", "Calling", or "In Season".
applies to nonhuman mammals: a state or period of heightened sexual arousal and activity
Period of time when a female hamster will accept mating.
the period of femal sexual receptivity
The periodic state of sexual excitement in the female of most mammals, excluding humans, that immediately precedes ovulation and during which the female is most receptive to mating; heat. Also known as estrus.
period of sexual activity in most mammals; 'heat'