Hormones

Question 1

When do male cattle reach puberty?

Answer 1

10-12 mnths

Question 2

When do male sheep reach puberty?

Answer 2

4-6 mnths

Question 3

When do male pigs reach puberty?

Answer 3

4-8 mnths

Question 4

When do male horses reach puberty?

Answer 4

13-18 mnths

Question 5

How does the male hormone cycle work - what is the first step…..

Answer 5

Hypothalumus produces GnRH (gonadotrophin) to the pituitary gland.

Question 6

Second step of the male hormone cycle…

Answer 6

Pituitary gland releases LH and FSH

Question 7

Where is the LH released from?

Answer 7

Leydig cells

Question 8

Where is FSH released from?

Answer 8

Sertoli cells

Question 9

What does LH stimulate in the male?

Answer 9

Testosterone

Question 10

What does testosterone do in the male?

Answer 10

Decreases the release GnRH and LH and stimulates spermatogenesis with FSH

Question 11

When do female cattle reach puberty?

Answer 11

8-11 mnths

Question 12

When do female sheep reach puberty?

Answer 12

7-10 mnths

Question 13

When do female pigs reach puberty?

Answer 13

4-7 mnths

Question 14

When do female horses reach puberty?

Answer 14

15-18 mnths

Question 15

What does the LH stimulate in the female?

Answer 15

Corpus Luteum and Ovulation

Question 16

What does the FSH stimulate in the female?

Answer 16

Follicle growth and Ovaries

Question 17

What does the corpus luteum do?

Answer 17

Releases progesterone, estrogen, relaxin and inhibin

Question 18

What does the FSH do?

Answer 18

Stimulates growth of follicles in ovary

Question 19

What does the LH do?

Answer 19

Causes follicles to rupture then becomes the corpus luteum

Question 20

What does prolactin do?

Answer 20

Maintains lactation

Question 21

What does oxytocin do?

Answer 21

Stimulates muscle contraction of uterus

Question 22

What does oestrogen do?

Answer 22

Stimulates oestrus and heat

Question 23

What does progesterone do?

Answer 23

Produced by the corpus luteum