equine reproduction Flashcards
1
Q
TF of all domestic livestock species horses are the least successful
A
T
2
Q
how long is a horses gestation length
A
11 months
3
Q
what is the management of a mare and foal
A
- one foal per mare per year (in the wild theres 2 foals every 2 years)
4
Q
what type of breeders are horses
A
- seasonal breeders
- due to the horses birthdays, jan 1st a year after birthday
- so they want foals born- jan and feb, so they can be old as possible (feb 14 is the orine day)
5
Q
how long is an estrous cycle
A
- 21 day average
- 3-16 cycles/yr
- changes because of breeds and geographical location
- horses closer to the equater are likely to have more cycles
- horses farther from equater are likely to have less
- 4-7 day average
6
Q
what is a problem with insemination
A
- timing for insemination and breeding
- 24-48 hours before ed of estrous
- egg viable for 6-8 hours - decreases over time, as does concentration and motility
7
Q
how can you manipulate a breeding season
A
- march and feb are optimal breeding times
- increases with daylight increase
- because horses are daylight breeders, they need to think its daytime
- they also need hormones
8
Q
what are reproductive disfunctions of the mare
A
- aberrant estrous cycles
- endometritis
9
Q
cycling abnormalitites
A
- peristent CL prolonged diestrus
- peristent cl results from defective PGF2 secretion
10
Q
what is peristent estrus
A
- granulosa theca cell tumours
11
Q
what is split estrus
A
- 2-4 days of sexual receptivity
- stops 24-48 hours
- restarts
12
Q
what is silent heat
A
- during egg maturation they display no signs of being in heat
13
Q
failure to maintain pregnancy
A
- accelerated regeneration of post ovulation CL
- egg might have been fertilized, it will be lost
- no uncommon especially in thoroughbreds probably because they are watched more then other breeds
14
Q
what is endometritis
A
- inflammation of uterine lining
- primary cause of subfertility or infertility
15
Q
what are reproductive dysfunction
A
- defective perineal conformation
- pneumovagina - air is asperated in the vagina because of conformation
- caslicks surgery - sew part of it up, to reduce contamination
