Puberty

Question 1

Hormonal control of puberty in females

Answer 1

• GnRH pulses inc as one reaches puberty

- surge at puberty and then low amplitude and frequency between cycles

Question 2

GnRH regulators

Answer 2

• devel of surge center: does not determine when puberty occurs but is capable of responding to estrogen before puberty
• change to feedback sensitivity to estrogen in female: at puberty, neg feedback decreases ad hypothalamus secretes more GnRH

Question 3

Silent ovulation at puberty

Answer 3

• first LH surge not assoc with estrus or ovulation

- caused by lack of progesterone

Question 4

Hormonal changes in male (ie stallion)

Answer 4

• GnRH inc, LH and FSH inc
• leydig mature in response but no testosterone released
• LH and FSH go down
• FSH inc and affect sertoli cells
• testosterone released in response to LH
• LH and FSH inc to adult levels

Question 5

Genetic effects on puberty

Answer 5

• breed age

- species

Question 6

Nutrition

Answer 6

• as animal develops, energy needed for growth decreases

- more energy available for reproduction

Question 7

2deoxyglucose

Answer 7

Blocks metabolism of of glucose, Knocks out LH pulses

Question 8

Environmental and social conditions

Answer 8

More sows together, reach puberty earlier

If boar is present, they reach even earlier