Lecture 18: Equine Theriogenology Flashcards
Estrogen induces __, they have __behavior
estrus, heat
Lutenizing hormone is the __induction agent
ovulators
LH is responsible for __maturation, production of __, __ and __
follicular maturation, production of estrogen, ovulation and lutenization
FSH is responsible for
follicular recruitment
progesterone suppresses __behavior
estrus
progesterone suppresses __ and prevents __
LH, ovulation
progesterone is produced by __
CL
what hormone maintains pregnancy
progesterone
GnRH promotes release of __ and __
FSH and LH
GnRH is the __induction agent
ovulatory
PGF2alpha induced __
luteolysis
PGF2alpha released __-__ days after ovulation if no embryo
13-16 days
how long is estrus cycle
4-6 days
what is dominant hormone during estrus
estrogen
what is mare behavior like during estrus
solicitous, squat, urinate, winking, clitoral eversion
What do you feel on palpation during estrus
uterus is very soft with edema, large follicles
How long is diestrus
15-17 days
what is dominant hormone during diestrus
progesterone
what is mare behavior like during diestrus
rejects stallion
what do you feel on palpation during diestrus
uterus is toned
horses are seasonally __, normally breeding season is __-__
polyestrous, April-October
describe the transition out of seasonal anestrus
as day length increases follicles begin to develop but will not ovulate until enough LH is present to trigger ovulation
how can you stimulate estrus out of breeding season
16hrs of light exposure
when is seasonal anestrus
November-march