ANSC 4402 -HORSE PRODUCTION EXAM
QUESTIONS AND ANSWERS A+ GRADED
What hormones does the ovary produce?
The ovary produces estrogen, progesterone, and relaxin.
What are the functions of estrogen?
Development of the reproductive tract and mammary system.
What produces estrogen?
follicles
What produces progesterone?
the corpus luteum
What does progesterone prepare the body for?
Progesterone prepares the uterus for pregnancy and maintains the pregnancy. It also
prepares the mammary glands for lactation.
What hormone dilates the birth canal?
Relaxin dilates the birth canal at foaling.
What is estrous?
Estrous is the complete reproductive cycle, about 21 days.
What stage of the estrous cycle is the mare in "heat" and how long does it last?
A mare is in "heat" when in estrus and this lasts about 6 days long.
How long is diestrus and what characterizes it?
Diestrus is about 15 days long and is when the mare is non-receptive, this is between
cycles.
What is the difference between anestrus and the transitional phase?
Anestrus is when the mare stops cycling, this is in the winter. The transitional phase is
in the spring when cycling starts, the ovaries begin to be active again.
Are the anestrus and transitional phase part of the estrous cycle, why or why
not?
Anestrus and the transitional phase are not part of the Estrous cycle because they end
and start the estrous cycle in the winter and spring. there is no estrous during winter.
How is a mares estrous cycle described and what does this mean?
Mares are seasonally polyestrous meaning they cycle during spring and summer.
How does melatonin impact a mares cycle?
Decreased melatonin, from more light, allows GnRH to be released and stimulate FSH
which starts the cycle.
Where is GnRH released from and what does it stimulate?
GnRH is released from the hypothalamus and it stimulates the pituitary gland to release
FSH
What are some signs that a mare is in heat?
frequent urination, squatting posture, backing up to stallion
What hormone is responsible for follicular maturation and ovulation? How many
eggs will ovulate?
LH does final maturation and ovulates one mature ova
When do mares ovulate? Because of this, when should you breed them?
QUESTIONS AND ANSWERS A+ GRADED
What hormones does the ovary produce?
The ovary produces estrogen, progesterone, and relaxin.
What are the functions of estrogen?
Development of the reproductive tract and mammary system.
What produces estrogen?
follicles
What produces progesterone?
the corpus luteum
What does progesterone prepare the body for?
Progesterone prepares the uterus for pregnancy and maintains the pregnancy. It also
prepares the mammary glands for lactation.
What hormone dilates the birth canal?
Relaxin dilates the birth canal at foaling.
What is estrous?
Estrous is the complete reproductive cycle, about 21 days.
What stage of the estrous cycle is the mare in "heat" and how long does it last?
A mare is in "heat" when in estrus and this lasts about 6 days long.
How long is diestrus and what characterizes it?
Diestrus is about 15 days long and is when the mare is non-receptive, this is between
cycles.
What is the difference between anestrus and the transitional phase?
Anestrus is when the mare stops cycling, this is in the winter. The transitional phase is
in the spring when cycling starts, the ovaries begin to be active again.
Are the anestrus and transitional phase part of the estrous cycle, why or why
not?
Anestrus and the transitional phase are not part of the Estrous cycle because they end
and start the estrous cycle in the winter and spring. there is no estrous during winter.
How is a mares estrous cycle described and what does this mean?
Mares are seasonally polyestrous meaning they cycle during spring and summer.
How does melatonin impact a mares cycle?
Decreased melatonin, from more light, allows GnRH to be released and stimulate FSH
which starts the cycle.
Where is GnRH released from and what does it stimulate?
GnRH is released from the hypothalamus and it stimulates the pituitary gland to release
FSH
What are some signs that a mare is in heat?
frequent urination, squatting posture, backing up to stallion
What hormone is responsible for follicular maturation and ovulation? How many
eggs will ovulate?
LH does final maturation and ovulates one mature ova
When do mares ovulate? Because of this, when should you breed them?
