Uterine involution Flashcards
What are the three stages of parturition?
Stage I I Initiation of myometrial contractions
Fetus initiated (ACTH corticoids)
PGF2a produced
Dilation of cervix and fetus enters cervix
OT stimulated myometrial contractions
Stage II I Expulsion of the fetus
OT stimulates contractions
Fetal movements (induced by hypoxia)
Rupture of membranes
Stage III I Expulsion of the fetal membranes
Chorionic villi dislodged from maternal
Vasoconstriction
. List 3 conditions/situations that would pre
dispose the uterus to bacterial contamination?
- Retained fetal membranes
- Dystocia
- Weak myometrial contractions
Describe 3 effects of excessive uterine bacterial
contamination on subsequent reproductive performance?
- Endometritis
- Prolonged uterine involution
- Delayed return to cyclicity
- Delayed reestablishment of pregnancy
What is a typical ovarian rebound time?
A silent oestrus around 20 days PP
List some factors that may delay ovarian rebound?
. parturient abnormalities . Milk yield . Nutrition . Parity . Suckling . Season . Climate
What does puerperium mean?
Post-partum period
What is uterine involution?
. Reduction in uterine size
. Endometrial repair
. Expulsion of lochia (lochia is the vaginal discharge
after giving birth (puerperium) containing blood,
mucus, and uterine tissue.
–>Pregnancy can re-established
How many lochia to bitches expel and what is it?
lochia is the vaginal discharge
after giving birth (puerperium) containing blood,
mucus, and uterine tissue.
Bitches expel first about day 1-3 PP and second 4-6 weeks later.
What are the key post-partum events?
. Reduction in uterine size
• Myometrial contractions and expulsion of lochia
. Endometrial repair
• Elimination of bacterial contamination from
reproductive tract
. Resumption of ovarian function
How quickly does uterine repair happen in the sow and when does ovarian activity resume PP?
28-30days
5-7 days from weaning.
How quickly does uterine repair happen in the cat and when does ovarian activity resume PP?
30days
Variable
How quickly does uterine repair happen in the mare and when does ovarian activity resume PP?
21-28 days
5-12 days
How quickly does uterine repair happen in the ewe and when does ovarian activity resume PP?
30 days 180 days (season)
How quickly does uterine repair happen in the bitch and when does ovarian activity resume PP?
90 days
135 days
How quickly does uterine repair happen in the dairy cow and when does ovarian activity resume PP?
45-50 days
18-25 days
