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Oestrous Cycle - Anatomy & Physiology (view source)

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==== Metoestrus ====

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* Starts when the bitch will no longer accept the dog.

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* There is dispute over the duration of this phase, with two main theories:

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** Ends when corpora lutea have regressed at 70-80 days.

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** Ends when endometrial repair is complete at 130-140 days.

==== Anoestrus ====

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