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RUSVM Physiology 2 > Reproductive Cyclicity > Flashcards

Reproductive Cyclicity Flashcards

1
Q

Polyestrus

A

present estrus cycle every 21 days, continuously across ayear

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2
Q

Polyestrus animals- classically

A

pig and cows

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3
Q

Seasonally polyestrus animals

A

Fall- short day breeders- sheep

Spring- Long day breeders- horses

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4
Q

Seasonal polyestrus involves what organ?

A

pineal gland- melatonin secretion effects cyclicity in these spp.

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5
Q

The hypothalamus secretes what hormone?

A

GnRH

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6
Q

The hypophysis secrets what hormones?

A

FSH and LH

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7
Q

Ovary secretes which hormones?

A

estradiol, progesterone and inhibin

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8
Q

Uterus secretes which hormones?

A

prostglandin, PF2 alpha

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9
Q

How long is the bovine estrus cycle?

A

18-24 days

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10
Q

The estrous cycle occurs in which two phases?

A

follicular and luteal phase

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11
Q

Follicular phase consists of what parts of the estrous cycle?

A

proestrus and estrus

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12
Q

Luteal phase consists of which parts of the estrous cycle?

A

Metestrus and diestrus

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13
Q

What hormones are involved in the follicular phase of estrous?

A

FH and LH- stimulate follicle growth
estradial- induces sexual behavior
estrogen

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14
Q

What hormones are involved in the luteal phase of estrous?

A

progesterone- produced by CL, decrease follicular growth

prostaglandin F2alpha-luteolysis

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15
Q

What occurs in proestrus?

A

increase in estradiol (E2) produced by developing follicles, increase in GNRH and LH

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16
Q

What occurs in estrus?

A

estradiol reach threshold (LH peak), behavioral estrus occurs and then ovulation

17
Q

What occurs in Metestrus?

A

follicular cells form the CL (after ovulation)

18
Q

What occurs in diestrus?

A

functional CL and high progesterone levels

19
Q

Corpus hemorrhagicum

A

after ovulation, is local hemorrhage

20
Q

What is anestrus?

A

animal not cycling, caused by pregnancy, lactation, season, presence of offspring, stress or pathology

RUSVM Physiology 2 (7 decks)

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