Estrous Cycle by Species

Question 1

Polyestrous, nonseasonal ovulators

Answer 1

Camelids
Pigs (sow)
Cattle (cow)

Question 2

Seasonally polyestrous ovulators

Answer 2

Cats (queen)
Horses (mare)
Goats (doe)
Sheep (ewe)

Question 3

Monoestrous, nonseasonal ovulators

Answer 3

Dog (bitch)

Question 4

_____ are nonseasonlly polyestrous and have a 21 day cycle

Answer 4

Cows and sows

Question 5

Cows ovuate _____ hours AFTER estrus, or ______ hours after the onset of estrus, and follow the AM/PM rule for breeding.

Answer 5

10-15 hours

24-30 hours

Question 6

Signs of estrus in a cow that indicate she should be bred within the next 10-12 hours

Answer 6

Standing to be mounted
Increased activity
Decreased milk yield
Clear vaginal mucus
Bellowing
Swollen vulva

Question 7

Follicular growth occurs in ____/____ and can be manipulated by supplementing during the ______ phage

Answer 7

stages/cohorts

recruitment

Question 8

Size of the follicle during:
Emergence ___
Deviation ___
Ovulation __

Answer 8

Emergence: 4mm
Deviation: 8mm
Ovulation: 10-20mm, 15-18mm

Question 9

The ____ is seasonally polyestrous and cycles every 17 days

Answer 9

Ewe

Question 10

In the Ewe, estrus lasts about ___ hours with ovulation beginning about _____ hours after the beginning of estrus.

Answer 10

36 hours

24-30 hours

Question 11

Signs of estrus in the Ewe

Answer 11

May seek out ram
Vulvar edema
Use of vasectomized ram

Question 12

Ewes and Does reach puberty at what age?

Answer 12

6-8 months

Question 13

The ____ is seasonally polyestrous and has a 21 day cycle

Answer 13

Doe and mare

Question 14

In the doe, estrus lasts _____ hours and ovulation begins within _____ hours after the onset of estrus

Answer 14

12-24 hours

12-36 hours

Question 15

Signs of estrus in the doe

Answer 15

Swollen vulva
Rapid tail movement
Restlessness; vocalization
Teaser buck
"Buck rag"
Vaginal mucus

Question 16

The sow attains puberty around what age?

*depending on breed

Answer 16

7 months

Question 17

Puberty in the sow can be hastened using what methods?

Answer 17

Stress
Boar effect
Hormones

Question 18

In the sow, the estrus cycle has no ________________

Answer 18

follicular wave development and atresia

Question 19

Estrus in the sow lasts ____ days and ovulation takes place during the last ___ hours of estrus

Answer 19

2-4 days

24 hours

Question 20

The mare attains puberty at what age?

Answer 20

11-12 months

*can be 8-15 months

Question 21

In the mare, _____ and _____ increase over an extended time period

Answer 21

estrogen and LH

Question 22

The cycle of the mare has 2 peaks of ____, unlike other species which have only one.

Answer 22

FSH

Question 23

In the mare, estrus lasts ____ days and ovulation occurs in the last ___ hours of estrus

Answer 23

5-7 days

48 hours

Question 24

The ____ is the only species that can ovulate during diestrus while progesterone levels are high

Answer 24

Equine

Question 25

Mare's cervix at the onset of estrus

Answer 25

Swollen and beginning to open. Folds are less defined.

Question 26

Mare's cervix toward the end of estrus

Answer 26

Swollen and relaxed. Fold hangs down, looking very vascular.

Question 27

Signs of estrus in the mare

Answer 27

Interest in stallions Raising tail "winking"

Question 28

The bitch attains puberty at what age?

Answer 28

6-12 months

Question 29

The ____ is nonseasonally monoestrous, and cycles every 6 months

Answer 29

bitch

Question 30

The estrous cycle of the bitch is divided into 4 stages:

Answer 30

Proestrus Estrus Diestrus Anestrus

Question 31

In the dog, _____ levels stay high for an extended period during proestrus and estrus, which last 18 days (allowing mating for an extended period of time)

Answer 31

estrogen

Question 32

At a good time for breeding the bitch, what should the vaginal cytology look like?

Answer 32

Cells cornified, without any RBC or neutrophils

Question 33

The queen attains puberty at what age?

Answer 33

6-10 months, depending on birth month

Question 34

The queen is seasonally polyestrous and is an _____ ovulator.

Answer 34

induced

Question 35

In the cat, diestrus lasts how long?

Answer 35

30-70 days

Question 36

Signs of estrus in the queen

Answer 36

Rubbing against people/objects vocalizing posturing

Question 37

Camelids attain puberty at what age?

Answer 37

5 months - 2 years *dependent on body weight

Question 38

Camelids are nonseasonally polyestrous and are _____ ovulators.

Answer 38

induced