Exam 3 Flashcards
T/F
The most common cause of abortion is placentitis/ Feto-placental infection
True
T/F
Twins in horses only have a 10% chance of being carried to term
True
T/F
Natural reduction of twins in horses have a high (>90%) success rate if embryos are fixed bilaterally
False
11%
Becomes true if manual
T/F
Transition in mares is the period between anestrus and the ovulating season
True
T/F
The uterine environment can significantly increase or decrease fetal development
True
T/F
PMSG (eCG) is commonly used to superovulate mares
True
T/F
The mares natural breeding season is April-September
True
T/F
Mares foaling in poor body condition will have a longer gestation period
True
T/F
Migration of the equine embryo between the horns is critical for maternal recognition of pregnancy
True
T/F
Currently, AQHA allows the registration of cloned horses
False
T/F
The estrus “heat” period in mares usually lasts about 7-9 days
False
5-7 days
T/F
Gestation length varies with sex whereby fillies are carried longer than colts
False
Colts carried 2-7 days longer
T/F
A large operation is performed on a mares vulva to help prevent uterine infection
False they just sew it
T/F
The period when the mare shows no signs of reproductive activity during the winter months is referred to as transition
False
Anestrus
T/F
The period between anestrus and the ovulatory season is called diestrus
False
Transition
T/F
Ovulation in the mare occurs 24-48 hours after the end of estrus
False
Prior to the end of estrus
T/F
Mares respond to 6 H of light which will induce ovulatory season
False
Enough to total 16 hours per day
T/F
In Oklahoma, artificial light should be started in November and 6 h of light must be added to the end of the day if you want estrus by February 1st
False
7-8
5:30 pm to 12:30 am
T/F
The normal gestation length in the mare is 340-345
True
T/F
PMSG causes formation of secondary CL which produce progesterone that helps maintain pregnancy
True
What is the proper insemination dose for artificial insemination with FRESH semen?
500x10^6
This hormone released by the anterior pituitary is responsible for the growth of follicles in mares
Follicle Stimulating Hormone (FSH)
This hormone produced by the follicle is responsible for the estrus behavior and the development of secondary sex characteristics
Estrogen
This hormone released from the anterior pituitary is responsible for the maturation and ovulation of the follicle
Leutenizing Hormone (LH)
