Exam 2 Flashcards
describe parturition in the ewe
cortisol - changes E2/PG enzyme synthesis in placenta
- increase E2- increase OT-R
- decrease P4 - removes myometrial block
- increase PGF2alpha - contractions, luteal regression
response to activation of fetal H/P/A axis
- preperatory - relax cervix, increase lube, contractions
- expulsion - chorioallantoic membrane ruptures, strong contractions
- cleaning - get rid of placenta & afterbirth, detachment of placenta & membranes
true or false, in female, wollfian ducts develop into uterus, oviducts, and anterior vagina.
false
true or false. in male, Wnt4 activates Sry
false
true or false. primordial germ cells originate in the genital ridge
false
name hormone and cell type involved with Wollfian ducts
testosterone & leydig cells
name hormone and cell type involved with Mullerian ducts
AMH (anti-mullerian hormone) & sertoli cells
describe how fetal male brain is masculinized
testosterone –> brain –> 5alpha reductase to DHT –> aromatase goes to E2
E2 masculinizes brain
true or false. during seasonal breeding in the ewe, estradiol will decrease the pulse amplitude of LH
true
true to false. during seasonal anestrus, progesterone will decrease the pulse amplitude of LH
false. decreases pulse frequency
true or false. the secretion of serotonin by pineal gland primary regulator of anestrus
false. melatonin
true or false. puberty in calf expected tp be delayed if animal reared on low plane of nutrition.
true
4 permissive signals that can affect onset of puberty
- male presence
- nutrition/BW
- seasonally polyestrus
- size of group of females
when discussing puberty, what is meant by the “developmental clock”
permissive factors affect it but still have to reach maturation first
true or false. the gonadostat hypothesis equates the exchanges that occur in feedback at puberty to a resetting of the H/P/G axis “thermostat”
true
inflammation of myometrium/endometrium
metritis
