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VM749: CLINSCI III > Mare Breeding Management > Flashcards

Mare Breeding Management Flashcards

(46 cards)

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1
Q

Identify the normal anatomic structures in the mare

A
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2
Q

Diagram the normal reproductive cycle in the mare

A
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3
Q

How long is the mare estrous cycle? What are the 2 stages and how long do those last?

A

Cycle: 21-23d
Estrus: 5-7d
Diestrus 14-16d

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4
Q

What does the cervix look like during estrus?

A

Cervix relaxes and softens
Open
Edema, tests on ventral vagina, clear mucus, pink

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5
Q

What does the cervix look like during diestrus?

A

Cervix tightens and closes
Protruding into vagina, mucus tacky and dry, pale pink coloration

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6
Q

At what rate do follicles grow during estrus?

A

Increases 3-5mm in diameter per day

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7
Q

What size is a follicle at ovulation?

A

~45mm
Usually a single ovulation

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8
Q

Where is the bladder located in relation to the uterus?

A

Anterior to pelvis, ventral to uterus

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9
Q
A
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10
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11
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12
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13
Q

What structure and what stage of the estrus cycle?

A
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14
Q

What structure and what stage of the estrus cycle?

A
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15
Q

What structure and what stage of the estrus cycle?

A
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16
Q

What structure and what stage of the estrus cycle?

A

Uterus in early estrus

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17
Q

What structure and what stage of the estrus cycle?

A

Uterus in late estrus

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18
Q

What structure and what stage of the estrus cycle?

A

Uterus in diestrus

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19
Q

What structures?

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A

Mutltiple follicles on ovaries
(Dominant follicle = largest = ovulatory)

20
Q

What are characteristics of ovulation on ultrasound?

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A

Irregular shape
Defined border

21
Q

What structure and what stage of the estrus cycle?

22
Q

What does a recent ovulation look like on ultrasound?

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A

Grey
No defined borders
Can have central fluid

23
Q

What structure and what stage of the estrus cycle?

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A

Recent ovulation

24
Q

What structure and what stage of the estrus cycle?

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A

Early corpus luteum

25
What structure and what stage of the estrus cycle?
Early corpus luteum
26
What structure and what stage of the estrus cycle?
Early corpus luteum
27
When is the corpus luteum considered "mature?
At 5 days
28
What role does progesterone play on uterine behavior?
Closed cervix Tones uterus No edema
29
What structure and what stage of the estrus cycle?
Corpus luteum
30
What structure and what stage of the estrus cycle?
Corpus luteum
31
What structure and what stage of the estrus cycle?
Corpus albicans (CL regression)
32
What structure and what stage of the estrus cycle?
Corpus albicans (CL regression)
33
What does the corpus albicans look like on ultrasound?
Small Black ring Often bright center
34
What is the criteria for induction of ovulation?
35mm follicle Estrus (uterine edema, relaxed uterine tone, open cervix, estrous behavior)
35
What role does HCG administration play in reproduction?
Induction of ovulation
36
What role does GnRH analogue administration play in reproduction?
Induction of ovulation
37
How long after ovulation induction will a patient ovulate?
1.5 to 2 days
38
What role does prostaglandin administration play in reproduction?
Causes lysis of CL and return to estrus- shortens cycle about a week **CL not fully susceptible to luteolytic effects of prostaglandin until 5 days after ovulation**
39
What are 2 types of prostaglandins used to induce luteolysis? What are the side effects?
Cloprostenol (Estrumate) Dinoprost (Lutalyse) *Side effects: short duration, sweat, scour, mild colic*
40
When do estrus and ovulation occur after luteolysis?
Estrus in 2-5d Ovulation ~9d
41
What type of breeders are horses?
Seasonally polyestrus *Cycles during periods of long daylight* Does not cycle during winter anestrus
42
What stimulates cycling in horses?
Increase in day length
43
What is the spring transition?
2-3m in length FSH increases prior to LH Increased follicle diameter, no ovulation Long estrus, variable periods
44
What structure(s)?
Follicles
45
When is the natural breeding season?
April to September
46
When is the artificial breeding season?
February 15 to July 15

VM749: CLINSCI III (54 decks)

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