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* By day 5 of dioestrus, the corpus luteum is 0.6cm in diameter.
 
* By day 5 of dioestrus, the corpus luteum is 0.6cm in diameter.
 
* It then attains a maximum size of 0.9cm diameter and has a central cavity.
 
* It then attains a maximum size of 0.9cm diameter and has a central cavity.
* Over the period of dioestrus, the colour changes from blood red to pale pink.  The size stays constant until the onset of th next oestrus.
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* Over the period of dioestrus, the colour changes from blood red to pale pink.  The size stays constant until the onset of the next oestrus.
 
* At the onset of the next oestrus:
 
* At the onset of the next oestrus:
 
** Regression of the corpus luteum of the previous cycle is rapid
 
** Regression of the corpus luteum of the previous cycle is rapid
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