additional Flashcards
when does LH peak
before ovulation
when does FSH peak
diestrus if nagovulate
if not nagovulate - right after ovulation
when does P4 peak
right after ovulation
progesterone will remain high until CL is destroyed
true
estradiol has an exponential increase when?
it is near ovulation
when does estradiol decrease?
after ovulation
__ and__ are luteotrophic unlike PGF2a
P4 and E2
in Maternal recognition of pregnancy the developing embryo should signal that the dam is pregnant to stop the estrous cycle
and the concentration of prostaglandin in maternal blood must be sustained
t/f
false. progesterone
suppresses pulsatile prostaglandin secretion
in goats
Caprine trophoblast protein (cTP-1)/ caprine tau interferon (oIFN- tau)
migration of conceptus in mares happen at days 9-16 T/F
true
why is maternal recognition important?
to retain CL
why is there no need for maternal recognition in dogs and cats
CL life > gestation phase
transrectal palpation for pregnancy diagnosis can also be done in pigs T/F
true
estrogen production by the conceptus alter the transport of PGF2a in pigs T/F
true
tx to anestrus sheep to restore reproductive function
kisspeptin
heifers can be bred at an earlier stage if it has a large scrotal circumference
true
light manipulation is effective in what species
- Mare, ewe, goat, cats (feral)
Providing one eye with blue light is enough to inhibit melatonin production T/F
true
- Common reproductive phenomena in cattle
subestrus or silent heat
kisspeptin can also be given in mares, mice, huamns
true
Prostaglandin should be administered of AFTER progesterone withdrawal (cows) T/F
at the time
-GnRH or hCG administration shortly BEFORE progesterone withdrawal (mare, cow, ewe)
After
T/F kisspeptin increases during breeding season
true
synthetic GnRH are effective only to animals close to puberty
true
GnRH in mares should be given BEFORE vernal transition
AFTER
what hormones do deslorelin inhibits when administered for prolonged periods
FSH, LH
placed in vulva to continuously produce progesterone
eCG thru - Controlled internal drug release (CIDR)
accumulation of fluids in abdomen, barrel shaped abdomen
dropsy
inhibin is produced by __ in females and___ in males
granulosa cells
sertoli cells in testis
these 2 act together to suppress FSH secretion.
Inhibin and oestradiol
t/f Tonic release of gonadotrophins, especially LH, does not occur at a steady rate but in a pulsatile fashion in response to a similar release of GnRH from the hypothalamus
true
Antral follicles are also known as tertiary follicles or
graafian follicles
the process whereby one or more of the recruited
follicles are selected to develop further
selection
he mechanism whereby one (the dominant fol-
licle) or several codominant follicles undergo further maturation in an environment in which the growth and development of other antral follicles is suppressed
dominance
gonadotrophin stimulation of a cohort of rapidly
growing antral follicles
recruitment
3 accepted descriptions of folliculogenesis
recruitment, selection, dominance
The dominant follicle secretes inhibin and oestradiol that feedbacks on the hypothalamus–pituitary axis to reduce circulatory FSH concentrations. Thus any antral follicle that is still FSH-dependent will regress and undergo atresia. T/F
true
The dominant follicle will further develop and can remain dominant for several days. It will undergo its final maturation and ovulate if progesterone concentrations increase T/F
not increase. DECLINE
____ is suppressive to LH secretin enabling increase in FSH
progesterone
plays a critically important role in the inhibition of the tonic mode of LH secretion
p4
t/f only FSH can induce early antral follicular growth
true
CL is rapidly formed from the____ follicle after ovulation,
Graafian
The hormones that are most likely to be involved in stimulating CL formation and maintenance
LH prolactin
prolactin plays a critical role in maintaining the CL in rodents and the dog T/F
true
2 components of luteal regresion
functional and structural regressio
current evidence indicates that leptin is likely to exert its effects on LH secretion by modulating ____
kisspeptin
