ANSC 4402 REPRO PHYS EXAM QUESTIONS AND
ANSWERS A+ GRADED
Purpose of relaxin
Dilates ("relaxes") the birth canal
Estrous vs Estrus
estrOUs- complete reproductive cycle (21 days)
estrUs- receptive to breeding (6 days)
When is a mare USUALLY anestrus?
winter months, less daylight, shorter days
Effect of light on melatonin
increased light (longer days) decreases the production of melatonin. Low melatonin
signals GnRH to be released
Signs of estrus or "heat"
labia winking
increased urination
receptive to breeding
irritation or moodiness
squatting posture near stallions
Another name for the diestrus period
luteal phase
Purpose of progesterone
prevents estrus or "heat"
increases cervical tone
inhibits LH
What day does maternal recognition happen
Usually day 16
Due to the migration of the embryo through the uterus
What happens at day 37(ish) of pregnancy
formation of an endometrial cup, a band of cells around the fetal sac
Ideal birthday for a foal
January 1
Functions of the ovary
produces ova
produces hormones
Hormones produced by the ovary
estrogen
progesterone
relaxin
Where is progesterone produced
corpus luteum
After the follicle develops:
ANSWERS A+ GRADED
Purpose of relaxin
Dilates ("relaxes") the birth canal
Estrous vs Estrus
estrOUs- complete reproductive cycle (21 days)
estrUs- receptive to breeding (6 days)
When is a mare USUALLY anestrus?
winter months, less daylight, shorter days
Effect of light on melatonin
increased light (longer days) decreases the production of melatonin. Low melatonin
signals GnRH to be released
Signs of estrus or "heat"
labia winking
increased urination
receptive to breeding
irritation or moodiness
squatting posture near stallions
Another name for the diestrus period
luteal phase
Purpose of progesterone
prevents estrus or "heat"
increases cervical tone
inhibits LH
What day does maternal recognition happen
Usually day 16
Due to the migration of the embryo through the uterus
What happens at day 37(ish) of pregnancy
formation of an endometrial cup, a band of cells around the fetal sac
Ideal birthday for a foal
January 1
Functions of the ovary
produces ova
produces hormones
Hormones produced by the ovary
estrogen
progesterone
relaxin
Where is progesterone produced
corpus luteum
After the follicle develops:
