FINAL EXAM: Length and Timing of Breeding Season

Question 1

2 types of breeding seasons

Answer 1

• non-commercial season

- commercial season (breeding for profit)

Question 2

Non-commercial season

Answer 2

1. natural day length program
2. normal breeding season (april-june)
3. foal when weather is mild
4. mares have ~4-5 cycles
5. Hand mating stallions ~90 days

Question 3

Commercial season

Answer 3

1. mares cycle on imposed daylight from lighting systems
2. breeding season ~Feb 15 - June 30 +/-
3. Avoid foals before January 1st

Question 4

Goal if timing of breeding during estrus

Answer 4

viable sperm present at ovulation

-sperm life in mare ~24-48 hours +/-

Question 5

Timing in commercial hand mating or AI

Answer 5

1. usually aim for 24 hour period
2. goal: inseminate/breed once per estrus
3. mare can be examined for follicular activity
4. time breeding based on exam

Question 6

Non-commercial hand mating

Answer 6

• same as commercial
• when not possible to exam mare frequently for follicular activity: breed on 2nd day of estrus and then every other 48 hours until out of estrus

Question 7

FSH

Answer 7

stimulates follicular development

Question 8

Estrogen

Answer 8

estrus behavior and reproductive tract receptive to conception

Question 9

LH

Answer 9

luteinizing hormone, stimulates ovulation and formation of CL

Question 10

Progesterone

Answer 10

makes repro tract viable for pregnancy; keeps mare out of estrus

Question 11

PGF2a

Answer 11

regresses corpus luteum

Question 12

Anterior pituitary gland

Answer 12

produces FSH & LH

Question 13

Graafin follicle

Answer 13

• ovary

- produces E2

Question 14

Corpus Luteum

Answer 14

• ovary

- produces P4

Question 15

Uterus

Answer 15

Produces PGF2a