Hormones & Purpose

Question 1

Cow & Bull - Gonadotropin releasing hormone (GnRH)

Answer 1

Controls release of LH & FSH from pituitary gland

Question 2

Cow & Bull - Luteinizing hormone (LH)

Answer 2

COW - Causes follicle to rupture (ovulation) and the formation of corpus luteum to replace follicle, large increase 24 hours before ovulation, soon after the onset of estrus BULL- Stimulates sperm production

Question 3

Cow & Bull - Follicle stimulating hormone (FSH)

Answer 3

COW - Stimulates growth of ovarian follicles

BULL - Stimulates sperm production

Question 4

Cow - Estrogen (E2)

Answer 4

Causes estrus and peaks at one set of standing heat, involved in development of mammary gland

Question 5

Cow - Progesterone (P4)

Answer 5

Necessary to maintain pregnancy, inhibits release of GnRH from hypothalamus, involved in development of mammary gland

Question 6

Cow - Prostaglandin (PGF)

Answer 6

Restarts estrous cycle by destroying corpus luteum

Question 7

Cow - Oxytocin

Answer 7

Cuases milk let-down, helps deliver the calf, stimulate muscular contractions of the uterus, which pushes calf out, responsible for involution of udder

Question 8

Cow - Relaxin

Answer 8

Helps deliver the calf, causes tissue in the birth canal to relax so calf can be born

Question 9

Cow - Prolactin

Answer 9

Critical to initiation and maintenance of lactation

Question 10

Cow - Adrenaline

Answer 10

Can interfere with milk ejection when cow becomes frightened

Question 11

Cow - Inhibin

Answer 11

Suppresses FSH

Question 12

Bull - Testosterone

Answer 12

Responsible for male sex drive (libido)