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=Introduction=
 
=Introduction=
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Ovarian cycles are from oestrus to oestrus.  Oestrus is the easily identifiable external marker.
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Ovarian cycles are from oestrus to oestrus.  Oestrus is the easily identifiable external marker. It should be noted that Oestrus is the noun and oestrous is the adjective.
 
      
= Classification of Oestrous Cycles =
 
= Classification of Oestrous Cycles =
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