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==Introduction==
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=Introduction=
The oestrous cycle is one term used to describe an ovarian cycle.  Another term for ovarian cycle is menstrual cycle which runs from menses to menses. Oestrous runs from oestrus to oestrus, an event which can be identified by changes in behaviour and hormone levels. Oestrus
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Ovarian cycles are from oestrus to oestrus.  Oestrus is the easily identifiable external marker.
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= Classification of Oestrous Cycles =
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= Species Differences =
    
==Comparative Oestrous Cycles==
 
==Comparative Oestrous Cycles==
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