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=== Oestrous Cycle ===
 
=== Oestrous Cycle ===
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* The domestic sow is generally polyoestrous, but the wild pig is a seasonal breeder with the main breeding season occuring in autumn with another peak in April.
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* There is some influence of photoperiod on reproduction in the domestic sow.
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** Anoestrus occurs more commonly in summer and less commonly in February.
    
=== Cyclic Changes in the Ovaries ===
 
=== Cyclic Changes in the Ovaries ===
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