Mammary Gland and Lactation

Question 1

all mammary gland tissue is derived from

Answer 1

ectoderm

Question 2

how long is the band stage?

Answer 2

30 days

Question 3

when do mammary lines occur?

Answer 3

35 days

Question 4

when is the bud stage?

Answer 4

43 days

Question 5

what shape is the bud?

Answer 5

spherical

Question 6

what are primary sprouts

Answer 6

round mammary buds proliferate to a solid core of epithelial cells. they are the first visible teat around day 80 of development. if they fail to develop, the gland will lack good development and will become blind teats (won’t appear)

Question 7

what do sprouts (galactrophores) differentiate into?

Answer 7

teat openings and gland cisterns

Question 8

what determines the # of openings per teat?

Answer 8

species variations in # of galactophores

Question 9

how many teats do mares have?

Answer 9

2 teats, 2 galactophores / teat = 2 openings per teat

Question 10

what happens to males?

Answer 10

grows to primary sprout
testosterone causes pinching off sprout from bud = failure of teat development