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Theriogenology > Rewproductive Physiology in the Mare > Flashcards

Rewproductive Physiology in the Mare Flashcards

1
Q

How is puberty defined and when is it in mares?

A

12-24 months –> first ovulation

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2
Q

How is puberty defined and when is it in mares?

A

12-24 months –> first ovulation

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3
Q

How is puberty defined and when is it in mares?

A

12-24 months –> first ovulation

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4
Q

Normal gestation in the mare

A

340 days average (320-365)

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5
Q

What is the placentation of a mare

A

diffuse, epitheliochorial (least invasive), microcotyledonary

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6
Q

When do endometrial cups show up and what do they do?

A

35-120 days

they are more invasive (syndesmochorial) and secrete eCG

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7
Q

How old do mares typically stop cycling?

A

24 yo

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8
Q

How long is the estrous cycle?

A

21-22 d

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9
Q

how long is estrus?

A

5-7 days

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10
Q

When is anestrus in the mare?

A

november to january

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11
Q

When is the physiological breeding season?

A

A/M to S/O

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12
Q

Normal gestation in the mare

A

340 days average (320-365)

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13
Q

Spring transition is also

A

vernal transition

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14
Q

When do endometrial cups show up and what do they do?

A

35-120 days

they are more invasive (syndesmochorial) and secrete eCG

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15
Q

How old do mares typically stop cycling?

A

24 yo

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16
Q

how many days of artificial light are required for ovulation

A

60 days

17
Q

how long is estrus?

A

5-7 days

18
Q

When is anestrus in the mare?

A

november to january

19
Q

When is the physiological breeding season?

A

A/M to S/O

20
Q

What is the physiological process of the mare’s heat?

A

receptors in eye –> pinneal gland –> more light=decreased melatonin –> increases GnRH from HT to Pit –> increases FSH, LH in circulation –> goes to the ovaries and testes

21
Q

Normal gestation in the mare

A

340 days average (320-365)

22
Q

What is the placentation of a mare

A

diffuse, epitheliochorial (least invasive), microcotyledonary

23
Q

When do endometrial cups show up and what do they do?

A

35-120 days

they are more invasive (syndesmochorial) and secrete eCG

24
Q

How old do mares typically stop cycling?

A

24 yo

25
Q

How long is the estrous cycle?

A

21-22 d

26
Q

how long is estrus?

A

5-7 days

27
Q

When is anestrus in the mare?

A

november to january

28
Q

When is the physiological breeding season?

A

A/M to S/O

29
Q

What is the physiological process of the mare’s heat?

A

receptors in eye –> pinneal gland –> more light=decreased melatonin –> increases GnRH from HT to Pit –> increases FSH, LH in circulation –> goes to the ovaries and testes

30
Q

What happens in fall transition in mares?

A

less light –> longer follicular waves –> delayed ovulation –> big follicles will rise up and then go down again and so on.. THere will be 3-5 waves with/wo follicles, then the GnRH will fall enough to not have waves.

31
Q

What happens in spring transtition in mares?

A

increased light = increased GnRH, but this happens slowly and the follicles start to grow and grow and more waves until the LH surge it high enough to ovulate

32
Q

Spring transition is also

A

vernal transition

33
Q

What are the characteristics of the anestrus uterus, cervix and vagina, and behaviour and follicular actiivty

A

pale dry vagina
flaccid uterus
atonic cervix
no interest in males

34
Q

How do early vs. later foalings differ

A

early will have foaling heat, then back to transitional. Later will go straight into normal cyclicity

35
Q

how many days of artificial light are required for ovulation

A

60 days

36
Q

What are the characteristics of an in estrus mare?

A 
soft uterine and cerv tone
large ovaries
developing follicles
uterine edema (wagon wheel), regressing CLs and foll growth
VERY receptive
37
Q

What are the characteristics of a mare in diestrus

A 
variable ovary size
increased uterine and cervical tone
no edema in uterus
CLs present
In general easier to palpate things
Reject violently

Theriogenology (14 decks)

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