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* Duration of oestrus is 7-10 days regardless of mating.
 
* Duration of oestrus is 7-10 days regardless of mating.
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=== Endocrine Changes During the Oestrous Cycle ===
      
* Oestrogen concentrations increase dramatically at the time of oestrus and may double over 24 hours.
 
* Oestrogen concentrations increase dramatically at the time of oestrus and may double over 24 hours.
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