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Repro > Estrous cycle > Flashcards

Estrous cycle Flashcards

1
Q

Estrus

A

Period when female is sexually receptive

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2
Q

Monoestrous

A

one estrous cycle per year

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3
Q

Polyestrous

A

Repeated cycles are uniformly distributed

Cattle, swine, rodents

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4
Q

Seasonally polyestrous

A

Repeated cycles for a portion of the year

Horses, sheep, goats, cats

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5
Q

Diestrus

A

period of sexual quiescence separating phases of the estrous cycle in polyestrous animals

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6
Q

Anestrus

A

period when female does not exhibit estrous cycles

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7
Q

What is day 0 of estrous cycle

A

Day of ovulation

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8
Q

What are the two stages of estrous cycle

A

follicular

Luteal

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9
Q

What is the follicular phase

A

follicles are dominant
20% of cycle
Estradiol

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10
Q

What is luteal phase

A

Period from ovulation until corpus lutea regression
80% of cycle
Progesterone

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11
Q

What are the 4 stages of estrous cycle

A

Proestrus
Estrus
Metestrus
Diestrus

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12
Q

What happens during proestrus

A

Transition from progesterone to estrogen

Female attracts male, but no mating

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13
Q

Estrus

A

Estrogens

SEX

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14
Q

Metestrus

A

estrogen to progesteone

no more sex

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15
Q

Diestrus

A

Maximum luteal function

female refuses male

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16
Q

What are the 2 stages of estrous cycle in the mare

A

Estrus and diestrus

17
Q

GnRH

A

Produced in hypothalamus

Release LH and FSH

18
Q

FSH

A

Acts on ovary to produce follicles

19
Q

Estradiol

A

Released by follicle
Produce estrous behavior
Triggers LH when low P4 (positive feedback)

20
Q

Inhibin

A

Released by follicle

Negative feedback, decrease FSH

21
Q

LH

A

LH surge induces ovulation

formation of CL

22
Q

Similarity between llama and cat

A

Induced ovulators

23
Q

Progesterone

A

Secreted by CL
Maintain pregnancy
inhibits LH

24
Q

Prostaglandin

A

Released by endometrium and myometrium

Lyses CL

25
Q

What does an increase of melatonin do to short day breeders

A

Makes them want the D

increase GnRH

26
Q

What does an increase of melatonin do to long day breeders

A

Decreases sexy time

Decrease GnRH

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