Watch for behavioral clues such as restlessness or vocalization that signal a female animal is in oestrus. The mare became more restless, indicating she was in oestrus.
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Physical Signs
Physical changes, like swelling or scent marking, can accompany oestrus in animals. The swelling of her vulva was a clear sign of oestrus.
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Zoo Context
In zoos, knowledge of oestrus helps keepers manage breeding and animal welfare. Keepers timed the introduction of the male to coincide with the female's oestrus.