PRADO PART 1 Flashcards
GnRH, FSH, and LH targets?
APG, granulosa cells (ovary), theca interna and luteal cells
FSH induces 2 hormone synthesis
estradiol, inhibin
FSH and LH is produced by the (organ)
anterior lobe of the pituitary gland
if there is a spike in LH, what does it stimulate ?
stimulates ovulation and the formation of corpus luteum (luteinization)
The more follicles grow, the more estradiol is produced T/F
T
2 hormones released by the granulosa cells
estradiol, inhibin
estradiol targets the following except:
brain
myometrium
reproductive tract lining
none
none
Arched back behavior indicating that a female will allow a male to mount her
lordosis
progesterone is released by
corpeus luteum, in or on ovary
P4 targets the following except:
hypothalamus
reproductive tract lining
brain
myometrium
alveoli
endometrium
2nd
P4 functions:
decrease GnRH release, increase reproductive behavior, increase myometrial contractions, increase alveoli devt, increase endometrial secretions
dec, dec, dec, inc inc
at low levels, P4 has a positive feedback on GnRh
false - either high levels dapat or negative feedback
what stage and under what phase?
FSH just peaked, inc E2 and inhibin, P4 low and non exsitent, LH tonic
proestrus/follicular
what stage and under what phase?
E2 and inhibin peaking, LH surge, declining FSH
estrus/follicular
marks the transition from follicular to luteal phase
ovulation
what stage and under what phase?
dec E2 & inhibin, tonic LH, inc p4, small FSH peak
metestrus/luteal
what stage and under what phase?
peak LSH, tonic LH, FSH, E2, inihibn peak
diestrus/luteal
what stage and under what phase?
peak LSH, tonic LH, FSH, E2, inhibin peak
diestrus/luteal
what stage and under what phase?
peak LSH, tonic LH, FSH, E2, inhibin peak
diestrus/luteal
what occurs AFTER (increasing) ovulation?
P4, FSH, inhibin
what occurs BEFORE (increasing) ovulation ?
LH and E2
seasonally polycylic animals include ewe, bitch, goat
false - monocyclic si dog
female becomes sexually mature and able to reproduce
puberty
Among females of the domestic species, puberty comes AFTER the development of physical maturity
false - precedes dapat
T/F no estrus cycle, no follicle growth
false - no estus, there is still growth
puberty is signalled by 1st estrus or 1st ovulation T/F
T
mares, queen cat, doe reach puberty at age
1-2 yo
7-12mo
4-8mo
cow, ewe, sow reach puberty at
7-8mo
6-15mo
6-8mo
chicken, bitch, pygmgy goat reach puberty at
18weeks (~4.5mo)
6-20mo
3 mo
what causes the changes during puberty? 2
pdtn of female gametes
hormone synthesis
hormone associated with onset of ovarian acity, hence puberty
LH
Puberty onset relies on the secretion of
ovarian oestradiol
before puberty, estrogen has an ___ effect when at low concn
inhibitory
puberty in males is based on the 3
behavior, age of 1st ejaculation, quality of ejaculate
influences the release of LH, FSH and prolactin, response to amount of daylight
melatonin
influences the release of GnRH
kisspeptin
pinealectomised ewews will still show seasonal breeding behaviors T/F
T
the mare does not require an intact pineal gland to show a normal repsonse to photperiod changes T/F
F - sheep to or require kasi pag walang pineal gland, no normal response
4 external factors influencing puberty
Nutrition
proximity of male
climate
disease
animal that has silent heat or subestrus
cow
increasing daylneth most important factor in this specues
cat
