Flashcards in Early Embryogenesis 2 (Ch. 13) Deck (19):
Gametes develop in the ___
Two sacks will form in the embryo, what are they called and what are their functions?
Amnion: allows for fetal symmetry
Allantois: recycles nutrients for fetal growth
What hormone initiates secretions that are necessary for pregnancy?
All livestock, except ___, will encounter the elongation process
What significant event happens during the elongation process of the embryo in ruminants?
Interferon tau is produced, which informs the mother of pregnancy
Prostaglandin is pulsed in the presence of ___ (hormone)
(T/F) Oxytocin is still released during pregnancy
During pregnancy the oxytocin receptors are blocked by ___ in what species?
Interferon tau (INF-t)
Ewe and cow
What kind of cells produce IFN-t?
(T/F) All animals produce INF-t
Only ruminants produce this
Maternal recognition of pregnancy must occur prior to ___
Describe how INF-t works
It is secreted by the trophoblast cells and decreases endometrial oxytocin receptors
This prevents PGF2-alpha synthesis and stops luteolysis
What is the conceptus?
It is the embryo and its adjunct parts
What happens in the sow that prevents luteolysis?
Estradiol reroutes PGF2-alpha
When a sow is pregnant the PGF2-alpha will be secreted (endocrine/exocrine)
(T/F) The faster an embryo elongates, the more nutrients it will be exposed to
When is STAT-1 released?
When a placenta is present
(T/F) If an oocyte is not fertilized in a mare it will migrate out of the oviduct
It will stay in the oviduct