3. Possible factors that induces parturition
Increases in
fetal size
Fatty
degeneration
of placenta
Physiological
factors
Increased co2
in maternal
blood due to
fetal activity
Release of fetal
antigen
serotonin
Biochemical
factors
6. Final Role of Oxytocin
Sensory Neurons in Cervix
Oxytocin from
Posterior Pituitary
Myometrial
Contractions
7.
8.
9. Signs of labor
enlargement of the
vulva
relaxation of the
sacro-sciatic
ligaments
dilation of the
cervix.
changes in quantity and
viscosity of vaginal
secretions
udder changes including
enlargement, tenseness
and filling of the teats
10. Process of parturition consists of 3 stages
stages
Stage 1: Cervical
dilation
Stage 3:
Expulsion of
the placenta
Stage 2:
Delivery of
the fetus
11. Stage 1
signs
The pastured cow
will usually seek
an isolated place.
Restlessness ,lie
down and get up
frequently
Occasionally,
she will kick at
her belly and
wring her tail.
The cow
(particularly first-
calf heifers) will
show signs of
uneasiness and
pain.
Vaginal
discharges
increase
12. Stage 2
signs
cervix is fully
dilated.
plus fetal parts enter the
birth canal
second water sac
(amniotic sac)