ANSC 333 - Final Exam complete Question and Answers 2024

ANSC 333 - Final Exam complete Question and Answers 2024 Epithelial For primates and rodents, the embryo will burrow itself underneath the ___________ layer of uterus. Invasion The process of the embryo burrowing itself underneath the epithelial layer of the uterus instead of on top 5 and 6 Implantation begins between day’s ___ and ___. 19 You can still flush embryos from a cow up to day ____. F T or F. Even after the embryo adheres to the uterus you can still flush the embryo. Allantois What is the membrane portion of the fetus that farm animals have but primates don't? Amnion When the "water breaks" before parturition it is the ___________ that's breaking. HCG (human chorionic gonadotropin) The protein that appears in human urine that indicates the female is pregnant For increased surface area (nutrition, etc.) Why does an embryo elongate? Elongate Not all embryos can ___________. Since they are not strong enough to go through this, this is the window where we lose the most embryos. 95% What is the average fertilization rate? (NOT PREGNANCY) Mother The biggest threat to the embryo is the ____________. Growth of the embryo and estrus Giving progesterone accelerates _____________________ and ______________. Progesterone During lute lysis, pgf2alpha pulses causes a decrease in __________________. Oxytocin When ______________ gets dumped into the body pgf2alpha rises. But if there's no receptor it can NOT be released. Interferon tau Maternal recognition of pregnancy signal produced by ruminants; blocks the oxytocin receptor Oxytocin Receptor Interferon tau blocks the ________________ ______________ so when oxytocin gets made it can't get released. Thus, there are no effects and luteolysis is prevented. Multinucleated syncytial (produce specific pregnancy hormones, make pregnancy test positive) After a certain point, some of the cells in the trophoblast start to reform into a ___________________ ______________ cell. No Can the release of pgf2alpha be stopped in pigs? Apical rather than basal The goal for pgf2alpha release in pigs is for it to be ______ rather than ________. Uterus Interferon Tau binds to its receptor and acts on the epithelium of the ______________. Now there is no oxytocin receptor. Elongation The process of the trophoblast cells elongating and producing interferon tau Will not If pgf2alpha is released as apical then the hormone _________ go into the bloodstream. luteolysis If the hormones can't get into the bloodstream then they can't get to the ovaries. Thus, ____________ is prevented. Estradiol (could be others but now it's just estradiol) _________________ is the maternal recognition hormone in the sow. Because they are a litter bearing species Why does the pig's embryo stretch more than other species? There is more competition The stretching of the embryo in pigs is faster than in other species. Why? Necrotic tip The main sensor on the embryos that are somehow used to send a signal when they stretch out so then they don't merge/collide (very important in pigs) We don't know What is the maternal recognition hormone in horses? Horse’s (has an extra protective layer around the ZP for this purpose) A ______________ embryo will migrate around the uterus while emitting a presence signal to the mother. Their embryos do NOT elongate. By squashing the fluid sacks; no How do you kill one of the twins in horses? Can you do this in other species? The horse has separate sacks and for other species they're joined Why can't you squash the fluid sacks in any other species besides the horse? Tape worm If you flush an embryo at day 16 it will look like a _________________. To generate more offspring to form a single, elite female What is the goal for superovulation? To synchronize donor and recipient female What is the first step for embryo transfer? The side with the CL If a recipient female has a CL, you will need to implant the embryo on _________________________________. folltropin The only product currently approved for superovulation is _________________. uterus Embryos have to be in the _______________ for collection. maintain quality of the oocytes (they need to be able to mature