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Oestrous Cycle - Anatomy & Physiology (view source)
Revision as of 10:27, 11 September 2008
, 10:27, 11 September 2008→Oestrous Cycle
** 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.
** 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.
* The oestrous cycle normally lasts 21 days, interrupted only by pregnancy and lactation.
* The oestrous cycle normally lasts 21 days, interrupted only by pregnancy and lactation.
* Oestrus normally lasts ~53 hours.
* Ovulation occurs 38-42 hours after the onset of oestrus.
* During lactation, the physical stimuli of suckling will suppress cyclic activity.
* Many sows show an anovulatory oestrus 2 days after farrowing.
* When weaning occurs at 5-6 weeks, oestrus occurs within 4-6 days.
* Earlier weaning results in a slightly longer interval before subsequent oestrus.
=== Cyclic Changes in the Ovaries ===
=== Cyclic Changes in the Ovaries ===