ANSC 4402 EXAM QUESTIONS AND ANSWERS A+
GRADED
What are the points to evaluate and determine the BCS of a horse?
Tailhead
Crease down loin
Withers
Crest / neck
Ribs
Behind the shoulder
What are the two primary functions of the ovary in the mare?
Produce eggs
Produce hormones
What is Estrous?
Refers to the complete 21 day reproductive cycle in a mare.
What is Estrus?
Refers to when a mare is in heat.Lasts about 6 days.
What is Diestrus?
Refers to the period between reproductive cycles when a mare in. non-receptive to
breeding. Last about 15 days.
What is Anestrus?
Period of temporary ovarian inactivity during the winter.
What does it mean when a mare is transitional?
She is coming back into breeding. season and her ovaries begin to activate again.
What is typical mare behavior while they are transitional?
They act as though they are in full heat and will back into and stand for the stallion to be
bred even though they cannot actually get pregnant during this phase.
What hormone is too low during the transitional period which keeps a mare from
developing mature follicles?
GnRH
What structure in the brain releases GnRH?
Hypothalamus
What has to decrease in order for the hypothalamus to release GnRH?
Melatonin, which decreases when amount of daylight increases.
What structure produces melatonin?
pineal gland
What size of follicles produce estrogen?
All follicles produce estrogen no matter the size.
What structure produces progesterone?
Corpus luteum, when a follicle ruptures.
What does the hormone relaxin do?
Dilates the cervix during labor (eases the delivery of baby).
What structure produces relaxin?
The ovaries.
GRADED
What are the points to evaluate and determine the BCS of a horse?
Tailhead
Crease down loin
Withers
Crest / neck
Ribs
Behind the shoulder
What are the two primary functions of the ovary in the mare?
Produce eggs
Produce hormones
What is Estrous?
Refers to the complete 21 day reproductive cycle in a mare.
What is Estrus?
Refers to when a mare is in heat.Lasts about 6 days.
What is Diestrus?
Refers to the period between reproductive cycles when a mare in. non-receptive to
breeding. Last about 15 days.
What is Anestrus?
Period of temporary ovarian inactivity during the winter.
What does it mean when a mare is transitional?
She is coming back into breeding. season and her ovaries begin to activate again.
What is typical mare behavior while they are transitional?
They act as though they are in full heat and will back into and stand for the stallion to be
bred even though they cannot actually get pregnant during this phase.
What hormone is too low during the transitional period which keeps a mare from
developing mature follicles?
GnRH
What structure in the brain releases GnRH?
Hypothalamus
What has to decrease in order for the hypothalamus to release GnRH?
Melatonin, which decreases when amount of daylight increases.
What structure produces melatonin?
pineal gland
What size of follicles produce estrogen?
All follicles produce estrogen no matter the size.
What structure produces progesterone?
Corpus luteum, when a follicle ruptures.
What does the hormone relaxin do?
Dilates the cervix during labor (eases the delivery of baby).
What structure produces relaxin?
The ovaries.
