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Created page with "Also see General Puerperium Changes of the puerperium must occur rapidly, with a return to the normal pregravid state, so that pregnancy ca..."
Also see [[Puerperium - Anatomy & Physiology|General Puerperium]]
Changes of the puerperium must occur rapidly, with a return to the normal pregravid state, so that pregnancy can occur as quickly as possible after weaning.
=== Involution ===
* Rapid initial uterine shrinkage in the first 5 days postpartum.
* After day 6, most uterine weight loss is due to changes in the myometrium:
** Reduction in cell size
** Reduction in cell numbers
** Reduction in the amount of connective tissue
* Uniform decrease in thickness of the endometrium and myometrium.
* Complete by 28 days
=== Restoration of the Endometrium ===
* 1 day after farrowing, the uterine epithelium is low columnar or cuboidal.
** Extensive folding present during pregnancy
* At 7 days, epithelial cells are very low and flattened, showing signs of degenerative change.
** Also signs of cell division, responsible for regeneration of the epithelium.
* Complete and capable of sustaining another pregnancy after 21 days.
=== Return to Ovarian Cyclicity ===
* Suckling and weaning have an effect on return to ovarian cyclicty (ovarian rebound) and other puerperial changes in the tract.
* 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.
* 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.
* Follicular activity occurs during suckling, which is sometimes associated with behavioural oestrus shortly after farrowing.
** No ovulation, follicles become atretic
* 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.
* Follicular growth and ovulation are supressed during lactation due to supressed LH secretion.
* FSH concentrations rise after weaning.
[[Category:Pregnancy and Parturition]][[Category:Pig]]
Changes of the puerperium must occur rapidly, with a return to the normal pregravid state, so that pregnancy can occur as quickly as possible after weaning.
=== Involution ===
* Rapid initial uterine shrinkage in the first 5 days postpartum.
* After day 6, most uterine weight loss is due to changes in the myometrium:
** Reduction in cell size
** Reduction in cell numbers
** Reduction in the amount of connective tissue
* Uniform decrease in thickness of the endometrium and myometrium.
* Complete by 28 days
=== Restoration of the Endometrium ===
* 1 day after farrowing, the uterine epithelium is low columnar or cuboidal.
** Extensive folding present during pregnancy
* At 7 days, epithelial cells are very low and flattened, showing signs of degenerative change.
** Also signs of cell division, responsible for regeneration of the epithelium.
* Complete and capable of sustaining another pregnancy after 21 days.
=== Return to Ovarian Cyclicity ===
* Suckling and weaning have an effect on return to ovarian cyclicty (ovarian rebound) and other puerperial changes in the tract.
* 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.
* 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.
* Follicular activity occurs during suckling, which is sometimes associated with behavioural oestrus shortly after farrowing.
** No ovulation, follicles become atretic
* 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.
* Follicular growth and ovulation are supressed during lactation due to supressed LH secretion.
* FSH concentrations rise after weaning.
[[Category:Pregnancy and Parturition]][[Category:Pig]]