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→Involution
* Mostly no return to oestrus and no ovulation until piglets are removed.
* Mostly no return to oestrus and no ovulation until piglets are removed.
* Time to first ovulation can be shortened by temporary removal of the whole litter for varying periods during the day (partial weaning), or permanent removal of part of the litter.
* Time to first ovulation can be shortened by temporary removal of the whole litter for varying periods during the day (partial weaning), or permanent removal of part of the litter.
* Rapid regression of corpora lutea of pregnancy, with cellular degeneration occuring by 3 days postpartum.
* Rapid regression of corpora lutea of pregnancy, with cellular degeneration occuring by 3 days postpartum.
* By day 7 postpartum, corpora lutea are mainly connective tissue.
* By day 7 postpartum, corpora lutea are mainly connective tissue.
** No ovulation, follicles become atretic
** No ovulation, follicles become atretic
* Preovulatory surge of LH within 7 days of weaning.
* Preovulatory surge of LH within 7 days of weaning.
* Prolactin concentrations are high during lactation but decline rapidly to basal levels within hours after weaning.
* Prolactin concentrations are high during lactation but decline rapidly to basal levels within hours after weaning.
* Follicular growth and ovulation are supressed during lactation due to supressed LH secretion.
* Follicular growth and ovulation are supressed during lactation due to supressed LH secretion.