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Repro Phys > Estrous and estrus > Flashcards

Estrous and estrus Flashcards

1
Q

Females unlikely to cycle

A

Pre-pubertal anestrus
Gestational anestrus
Post-partum anestrus
Seasonal anestrus

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2
Q

Four phases of bovine estrous cycle

A

Estrous
Metestrus
Diestrus
Proestrus

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3
Q

Estrus:

A

Graafian follicle on ovary, estrogen being produced, period of sexual receptivity
24 hours

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4
Q

Metestrus

A

Surge of Luteinizing hormone
Corpus hemorragicum develops on ovary
Initial development of Corpus Luteum
5 days

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5
Q

Diestrus

A

CL on ovary
Progesterone produced at high levels
10 days

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6
Q

Proestrus

A

CL is regressing
And follicular development is initiated again
5 days

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7
Q

What stimulates release of gnrh that causes release of fsh?

A

Suppressed progesterone levels

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8
Q

What is the stimulus for surge of gnrh and lh?

A

Presence of Graafian follicle

Estrogen

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9
Q

What is stimulus for decline in progesterone?

A

Release of prostaglandin f2 alpha

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10
Q

Estrous cycle length for sow

A

21 days

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11
Q

Estrous cycle length for cattle

A

21 days

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12
Q

Estrous cycle length for ewes

A

17 days

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13
Q

Estrous cycle length for mares

A

22 days

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14
Q

Estrus duration and ovulation

Sows

A

44 hours

Near end of estrus

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15
Q

Estrus duration and ovulation cattle

A

14-18 hours

12 hours after end of estrus

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16
Q

Estrus duration and ovulation ewes

A

30 hours

Near end of estrus

17
Q

Estrus duration and ovulation mares

A

4-7 days

24-48 hours before end estrus

18
Q

Follicular waves involve

A

Recruitment
Selection
Dominance
Atresia

19
Q

3 reproductive behaviors females exhibit

A

Attractivity-attract males
Proceptivity- stimulate copulation
Receptivity-ensure insemination

20
Q

Attractivity in cattle

A

Increased locomotion
Vocalization
Twitching and tail elevation

21
Q

Proceptivity in cattle

A

Grooming

Mounting other females

22
Q

Receptivity cattle

A

Homosexual mounting

Standing to be mounted

23
Q

Attractivity mares

A

Locomotion

Erected tail flagging

24
Q

Proceptivity mares

A

Urination stance

25
Q

Receptivity mares

A

Present hindquarters to stallion
Labial eversion
Contractions of labia

26
Q

Estrus detection mares

A

Rectal palpation

Teasing

27
Q

Attractivity ewes

A

Restlessness

28
Q

Proceptivity ewes

A

Urination

29
Q

Receptivity ewes

A

Immobile stance

30
Q

Estrus detection ewes

A

Marking harness

Brisket paint

31
Q

Attractivity sows

A

Restlessness

32
Q

Proceptivity and receptivity sows

A

Immobile stance

33
Q

Estrus detection sows

A

Back pressure

Boar presence

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