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Early Embryogenesis & Maternal Recognition of Pregnancy (Ch 13) -…
Early Embryogenesis & Maternal Recognition of Pregnancy (Ch 13)
syngamy
fusion of male and female pronuclei
zygote becomes an embryo
2 celled embryo
becomes a morula
4-8 cell embryo
becomes an early blastocyst
inner cellular mass
gives rise to body of the embryo
blastocoele
trophoblast
gives rise to the chorion
blastocyst hatches
fluid accumulates
enzymes are produced
blastocyst contracts
extraembryonic membranes of the preattachment embryo
yolk sac
chorion
amnion
provides a fluid filled protectice sac for the developing fetus
allantois
collects liquid waste from the embryo
progesterone must stay high
must prevent luteolysis
ewe & cow
blastocyst secretes interferons
suppresses oxytocin receptors and prevents oxytocin from binding and prevents secretion of PGF2a
sow
blastocyst produces estradiol and causes PGF2a secretion
rerouted to uterine lumen to be destroyed instead of going to cause luteolysis
must have 2 conceptuses present in each horn for pregnancy to be maintained
mare
presence of the conceptus prevents luteolysis
must migrate through horns between 12 and 14 times per during during days 12-15
distributes pregnancy recognition factors to endometrial cells
cat & dog
no recognition because gestation is the same length as one cycle
superovulation
treat female with gonadotropins to increase the number of oocytes selected to become dominant and ovulate
increases the number of potential offspring from donor females
