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Oestrous Cycle - Anatomy & Physiology (view source)
Revision as of 10:22, 11 September 2008
, 10:22, 11 September 2008→Oestrous Cycle
* 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.
* 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.
* There is some influence of photoperiod on reproduction in the domestic sow.
* There is some influence of photoperiod on reproduction in the domestic sow.
** Anoestrus occurs more commonly in summer and less commonly in February.
** Anoestrus occurs more commonly in summer and less commonly in February and March.
** Ovulation rate is lower in summer.
** Artificially reducing the day length from May-August will decrease the interval from weaning to oestrus from 23.6 days on average to 5.7 days.
=== Cyclic Changes in the Ovaries ===
=== Cyclic Changes in the Ovaries ===