Hormones Flashcards
When do male cattle reach puberty?
10-12 mnths
When do male sheep reach puberty?
4-6 mnths
When do male pigs reach puberty?
4-8 mnths
When do male horses reach puberty?
13-18 mnths
How does the male hormone cycle work - what is the first step…..
Hypothalumus produces GnRH (gonadotrophin) to the pituitary gland.
Second step of the male hormone cycle…
Pituitary gland releases LH and FSH
Where is the LH released from?
Leydig cells
Where is FSH released from?
Sertoli cells
What does LH stimulate in the male?
Testosterone
What does testosterone do in the male?
Decreases the release GnRH and LH and stimulates spermatogenesis with FSH
When do female cattle reach puberty?
8-11 mnths
When do female sheep reach puberty?
7-10 mnths
When do female pigs reach puberty?
4-7 mnths
When do female horses reach puberty?
15-18 mnths
What does the LH stimulate in the female?
Corpus Luteum and Ovulation
What does the FSH stimulate in the female?
Follicle growth and Ovaries
What does the corpus luteum do?
Releases progesterone, estrogen, relaxin and inhibin
What does the FSH do?
Stimulates growth of follicles in ovary
What does the LH do?
Causes follicles to rupture then becomes the corpus luteum
What does prolactin do?
Maintains lactation
What does oxytocin do?
Stimulates muscle contraction of uterus
What does oestrogen do?
Stimulates oestrus and heat
What does progesterone do?
Produced by the corpus luteum
