The Estrus reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Estrus

Estrus (also œstrus) or heat in female mammals is the period of greatest female sexual responsiveness usually coinciding with ovulation. Most female mammals will only seek sex during their heat.

Etymology: The Latin oestrus, meaning frenzy, or gadfly. This in turn comes from the Greek oistros, which has the same meaning.

See also Endometrium

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