Changes

Puerperium - Sow (view source)

Revision as of 06:40, 30 October 2015

455 bytes removed , 06:40, 30 October 2015

Line 28: Line 28:

* 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.

−

* 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

−

* 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.

* By day 7 postpartum, corpora lutea are mainly connective tissue.

Line 35: Line 33:

** No ovulation, follicles become atretic

* 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.

* Follicular growth and ovulation are supressed during lactation due to supressed LH secretion.

Gokuldas

13

edits