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Reproduction > Estrous Cycle Comparison > Flashcards

Estrous Cycle Comparison Flashcards

1
Q

How long is the typical estrous cycle of bovine?

A

21 days

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2
Q

How long is estrus of bovine

A

12 to 18 hrs

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3
Q

Avg size of dominant follicle in bovine?

A

9-13mm

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4
Q

How many follicular waves do lactating holstein tend to have?

A

2 waves/cycle

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5
Q

How many follicular waves do beef and dairy heifers have?

A

2 or 3 waves/cycle

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6
Q

What does the # of follicular waves determine?

A

Estrous cycle

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7
Q

What does a peak in FSH proceed?

A

Follicular wave - each FSH peak indicates a follicular wave

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8
Q

How long is the porcine estrous cycle?

A

21 days

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9
Q

How long is estrus in porcine?

A

50hrs

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10
Q

Do pigs have follicular waves?

A

No, every day during estrous you have the formation of new follicular wave

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11
Q

What occurs on day 15 and 16 of pig estrous?

A

40% of follicles present will undergo atresia or degeneration before LH surge

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12
Q

What is ovulation rate in pig affected by>

A

Age
Breed
Nutrition

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13
Q

What type of estrous cycle do equine have?

A

Seasonal polyestrus (long day)

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14
Q

How long is estrous cycle in equine?

A

21 days

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15
Q

How long is estrus in equine?

A

7 days

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16
Q

3 Characteristics of mare estrous cycle

A
  1. Prolongation of LH secretion
  2. Rather than a surge in the LH secretion, LH increase is more gradual
  3. FSH has a long lifespan
17
Q

What type of estrous cycle do ovine have?

A

Seasonal polyestrus (short Day)

18
Q

Estrous cycle length in ovine?

A

17 days

19
Q

Duration of estrus in ovine?

A

30hrs

20
Q

What things influence estrous cycle in ovine?

A

Breed
Age
Season
Presence of male

21
Q

Length of estrous in bitch

A

6 months

22
Q

Length of estrus in bitch

A

9 days

23
Q

When does ovulation occur in bitch?

A

48-60hrs after LH surge

24
Q

What does proestrus end with in bitch?

A

Receptivity of female

25
Q

How long can sperm survive in utero in bitch?

A

7 days

26
Q

How do progesterone levels compare between pregnant and non-pregnant bitch?

A

P4 levels are similar

27
Q

How often does the queen enter estrus?

A

Every 17 days

28
Q

How long is estrous in caprine?

A

20-21 days

29
Q

How long is estrus in caprine?

A

22-60hrs

30
Q

How many ovaries do chickens have?

A

1

31
Q

How often can chicken produce an egg?

A

1/day

32
Q

How does progesterone act in chicken?

A

Like estradiol

It will influence the surge center to release GnRH when a threshold is reached

Reproduction (16 decks)

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