Quiz 4

Question 1

true or false. in the ewe, parturition occurs in response to activation of the fetal H/P/A axis

Answer 1

true

Question 2

at parturition in ewe, what causes release of oxytocin from maternal posterior pituitary

Answer 2

pressure senses in cervix

Question 3

puberty in lamb 5-6 months. had lambs last october, when should come into puberty?

Answer 3

11-12 mo - next breeding season - next October

Question 4

what gland produces melatonin?

Answer 4

pineal gland

Question 5

swine - 20 gilts, 1 mature boar. puberty usually 28 weeks. what age should these gilts reach puberty?

Answer 5

earlier (24 weeks) b/c of boar

Question 6

what 2 hormones decrease pulse frequency during anestrus

Answer 6

estradiol & progesterone

Question 7

Sry testis determining factor - Sry activates:

Answer 7

SF1

Question 8

true or false. males with extra Y and females with extra X normal fertility

Answer 8

true

Question 9

true or false. during sexual differentiation in males, fetal leydig cells secrete testosterone which induces degeneration on Mullarian Ducts

Answer 9

false. AMH degrades Mullerian ducts

Question 10

during sexual differentiation, what cells produce anti-mullerian hormone (AMH)?

Answer 10

sertoli cells

Question 11

male brain masculinized by:

Answer 11

estradiol & DHT

Question 12

describe role of alpha-fetoprotein with respect to prenatal brain development

Answer 12

it binds to E2 to prevent it from crossing membrane; will become a female if present