9B: Estrus cycle

Question 1

Estrus cycle – 21
Proestrus – 2
Estrus – 18 hours (12-24 hours)
Ovulation – 10-16 hrs
Metestrus – 2
Diestrus – 16

Answer 1

COW

Question 2

Estrus cycle – 20
Proestrus – 2
Estrus – 18 hrs (12-24 hrs)
Ovulation – 10-16 hrs
Metestrus – 2
Diestrus – 15

Answer 2

HEIFER

Question 3

Estrus cycle – 2-3x / year
Proestrus – 5-9
Estrus – 7-9
Ovulation – 3 days after onset of estrus
Metestrus – 2
Diestrus – variable

Answer 3

BITCH

Question 4

Estrus cycle – 17
Proestrus – 2
Estrus – 1.5
Ovulation – last 1/2 of estrus
Metestrus – 2
Diestrus – 11.5

Answer 4

EWE (sheep)

Question 5

Estrus cycle – 21
Proestrus – 2
Estrus – 3
Ovulation – 21-36 hours after onset of estrus
Metestrus – 2
Diestrus –14

Answer 5

DOE (deer)

Question 6

Estrus cycle – 21
Proestrus – 2
Estrus – 3
Ovulation – 21-36 hours after onset of estrus
Metestrus – 2
Diestrus –14

Answer 6

PIG

Question 7

Estrus cycle – 14-21
Proestrus – 1-3
Estrus – 5-10
Ovulation – 24-32 hours after LH surge
Metestrus – 2
Diestrus – variable

Answer 7

CAT