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455 bytes removed ,  06:40, 30 October 2015
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* 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.
* Weaning pigs immediately after farrowing or within three weeks of delivery results in higher incidence of anestrus and a longer weaning-to-estrus interval, ovulation failure, or a reduced litter size
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* Female pigs that fail to ovulate either show follicular regression or develop cystic ovarian diseases.
   
* 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.
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** 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.
* Most of the sows resume cyclicity within a normal weaning-to-oestrus interval of less than 7 days if they are weaned after 3 weeks of farrowing
   
* 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.
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