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=== Oestrous Cycle ===
 
=== Oestrous Cycle ===
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* Short day breeders (oestrous cycles commence in response to decrease in day length).
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* In Britain, sheep cycle from October-February, during which time there are 8-10 recurrent oestrous cycles.
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* Ewe lambs and yearling ewes have shorter breeding seasons than older ewes.
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* The length of the oestrous cycle is about 17 days.
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* Duration of oestrus in most British breeds is ~30 hours and is at least 10 hours in immature ewes.
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* In merino sheep, behavioural oestrus (heat) may last 48 hours.
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* Ovulation occurs towards the end of oestrus.
    
=== Cyclic Changes in the Ovaries ===
 
=== Cyclic Changes in the Ovaries ===
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