TOPIC 2: ESTRUS Flashcards
surest sign animal is in heat
Receptivity
period of receptivity
estrus
happens in animals that are seasonally polyestrous animal such as Sheep
anestrus
period where animal not in heat but have still ovarian activity
diestrus
phase where there is marked increase in reproductive activity
proestrus
phase where CL regresses from previous cycle
proestrus
phase of cornification of cells
proestrus
The period of acceptance of the male
estrus
The uterine, cervical and vaginal glands secrete increased amounts of mucus; the vaginal epithelium and endometrium become hyperaemic and congested, and the cervix is relaxed.
estrus
Ovulation is a spontaneous process in most domestic species
true: Except cat, rabbit and camelids
Ovulation is induced by the act of coitus
The main ovarian hormone produced in estrus is
estradiol
follicular phase of the cycle
Proestrus and Estrus
s the main hormone in the follicular phase
in estrus
progesterone
follicular growth and regression of CL
proestrus
follicular growth and ovulation occrs
estrus
there is reduction of mucus secretion from uterine,cervical, and vaginal glands
metestrus
The granulosa and ___cells of the ovulated follicle give rise to ____cells, which are responsible for the formation of the CL
theca
lutein (luteal)
phase where there is fully functional CL
diestrus
cervix become constricted and secretions become scant
diestru
luteal phase of the cycle
met and di
main hormone in luteal phase
P4
In most of our domestic species ____ is the only readily identifiable phase of the oestrous cycle
estrus
phase where there is nonfunctional CL and minimal follicular devt
anestrus
hormone that regresses CL
PGF2a
hypothalamus produces (hormones)
GnRH, kisspeptin
anterior pituitary produces what hormones/s
FSH, LH
ovary produces what hormone/s
progesteron, estradiol
uterus [roduces what hormone
pgf2a
Foals are aged from 1 January, irrespective of their actual birth date in southern hemisphere t/f
false. northern
breeeding season in northern hemisphere
FEB 15-JULY1
The average length of the equine oestrous cycle
20-23 days
In heat: cervix is relaxed due to action of __
estrogen
During anoestrus and pregnancy:
both the vagina and cervix have a pale pink colour the cervix is narrow, constricted and generally turned away from the midline
The external os being filled with tenacious mucus
t.f
false. blanched color
If the mare is in oestrus the stallion usually exhibits
flehmen
eCG does not stimulate ovarian activity in mares in anestrus
true
desloreline effect
GnRH
in ewes, administration of eCG should be preceded by ___ administration
progesterone
hormone used in vaginal devices in cows and ewes
progesterone
Prior to progesterone treatment:
mare should have _____
cows should have ____
adeq lighting
GnRH admin
_____ should be administered at the time of progesterone withdrawal (cows)
Prostaglandin - pGF2a
GnRH or ___ should be administered shortly after progesterone withdrawal (mare, cow, ewe)
hCG
kisspeptin site of action
hypothalamus where GnrH neurons are located
Marketed mainly as a contraceptive in dogs
suprelorin
function of eCG
stimulates follicle growth
this should not be used in in lambs but only in mature sheep
melatonin
what will happen if immature sheep will be given melatonin?
delayed onset of puberty
why is P4 given?
to advance and induce heat
prolactin inhibitors like ____ and _____ can cause _____ of follicles
cabergolin, bromcriptine
luteinization
