Mare Management

Question 1

Ideal BCS of mares

Answer 1

5 (6+)

Question 2

If you are trying to increase your mare’s BCS, what should you feed her?

Answer 2

Increase feed intake, increase calories, feed concentrates

Question 3

Leptospriosis causes _____ every time. Vibriosis causes _____.

Answer 3

Abortion; early abortion

Question 4

Brucellosis has a _____ abortion

Answer 4

6-9mo

Question 5

What is regumate?

Answer 5

Synthetic progesterone

Question 6

When to use regumate? (6)

Answer 6

1. To suppress estrus
2. To synchronize estrous
3. For pregnant mares and older mares
4. For embryo transfer
5. Post-surgery
6. For transportational purposes

Question 7

To synchronize estrus, use progestins (progesterone, regumate) for _____ days with _____ at the end of treatment.

Answer 7

8-10 days with PGF2alpha

Question 8

Foals weaned at

Answer 8

4-6mo

Question 9

Weaning is stressful on foals and may cause _____ if not done properly

Answer 9

Illness, injury, reduced growth

Question 10

Creep feeding may increase foal’s

Answer 10

gain, specifically 30d feed prior to weaning

Can help maintain skeletal soundness

Question 11

Which foals should be weaned first?

Answer 11

Oldest foals or ones with the meanest mares

Question 12

Two types of weaning

Answer 12

Gradual vs. Abrupt

Question 13

Gradual weaning

Answer 13

Foals can see and hear mamas but they cannot nurse.
Creep feed them
Do this for about a week and then wean completely.
Less stress on the foals

Question 14

Post-weaning

Answer 14

10-14d stress for foals and owners

Foals more prone to illness

Question 15

LH stimulates

Answer 15

Ovulation

Question 16

4 advantages to AI

Answer 16

Disease control
Safetly
More mares can be used
Avoids problem stallions and problem mares

Question 17

What’s the most important part of breeding management? Specifically the seasonal impact

Answer 17

Light

Need 16hr of light (8 hr of dark)

Question 18

The mares eyes pick up on light through _____ gland which secretes _____

Answer 18

Pineal gland which secretes melatonin

Question 19

When daylight increases, the pineal gland _____ melatonin which acts on the _____ to produce _____.

Answer 19

Decreases; hypothalamus; GnRH

Question 20

When the melatonin decreases, GnRH _____ which impacts the _____ causing the release of _____ and _____.

Answer 20

Increases; anterior pituitary; LH and FSH

Question 21

FSH stimulates follicle which produces _____ which has a positive impact on _____

Answer 21

Estradiol; LH

Question 22

LH causes _____ which causes the follicle to become a _____

Answer 22

ovulation; corpus luteum

Question 23

CL produces _____. If the CL doesn’t get fertilized, _____ will regress the CL.

Answer 23

Progesterone; PGF2alpha

Question 24

Estradiol causes _____

Answer 24

Estrus behavior

Question 25

_____ for mare to recognize embryo

Answer 25

6 days

Question 26

DSP

Answer 26

Daily sperm production based on scrotal width and testicular tissue

Question 27

DSO

Answer 27

Daily sperm output; transfer takes 9 days, sperm maturation

Question 28

Longest day of year; pivotal point

Answer 28

June 21

Question 29

Estrous cycle

Answer 29

21-23d

Question 30

Estrus

Answer 30

5-7d

Question 31

Diestrus

Answer 31

14-16d

Question 32

Breed before _____

Answer 32

ovulation

Question 33

Stallions impacted by light, how?

Answer 33

DSP increases

Question 34

Foals grow slower in obese mares because of

Answer 34

Decreased milk production

Question 35

4 factors predicting ovulation

Answer 35

1. Days in estrus
2. Size of largest follicle (40-45mm)
3. Growth of largest follicle
4. Date from previous cycle

Question 36

Which will take longer for a mare to ovulate? GnRH or hcG?

Answer 36

GnRH because it acts on the pituitary, while hcG acts on the ovary and therefore works faster

Question 37

Why use prostaglandins?

Answer 37

Short cycle
Pseudopregnancy
Estrous synch
Induction of abortion