reprohen

REPRODUCTION IN BIRDS

MALE

2 testicles in abdominal cavity

production AND maturation of spermatozoa occur in seminiferous tubules

body temp doesn't inhibit spermatogenesis

vas deferens leads to cloaca

no accessory sex glands

papillae on cloacal wall serve as copulatory organ

FEMALE

Only left ovary and oviduct develop

eggs much bigger

• (reason:)

no estrous cycle

ova develops - yolk

moves into infundibulum

3 hrs in magnum - thick albumin

1 hr in isthmus

20 hrs + in uterus, shell + thin albumin

egg rotated 180 degress

oxytocin causes muscle contraction

uterus everts or prolapses

incubation = 21 days chicken, 28 days turkey