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noun. applies to nonhuman mammals: a state or period of heightened sexual arousal and activity.
Sentences with oestrus
1. Verb, base form
There are four cycles to oestrus: proestrus, estrus, diestrus and anestrus.
2. Noun, singular or mass
When your border collie reaches 6 months of age, she will soon have her first oestrus, or "heat" cycle, which will occur approximately every seven months.
False pregnancies in dogs occur about 6 to 12 weeks after a dog's oestrus cycle, or heat cycle.