Reproduction Final Part 8 (Pozor) Flashcards
Which chromosome is the sex chromosome in chickens? What about pigeons?
Chickens –> 5th
Pigeons –> 4th
In avian species, what are the chromosomal combinations for male and female?
Male –> ZZ
Female –> ZW
At what point in avian development is sex determined?
Ovulation
Describe the location of the testis in birds.
Dorsal to the caudal end of the lung and cranial margin to the kidney.
Describe the different colors that avian testes may be depending on species.
Cream –> most
Black –> cockatoos
Grey-green –> toucans
Describe the positioning of the avian epididymis on the testis.
Dorsomedial surface
T/F: Birds have NO male accessory sex glands.
TRUE
How is mechanical sex achieved in birds?
Since males don’t have penises, birds breed by cloacal touching.
Contrast determinate egg layers from indeterminate egg layers.
Determinate egg layers produce a fixed number of eggs no matter what. Indeterminate egg layers can increase their egg production to replace lost eggs.
Describe the avian ovary.
- Left side develops in most birds
- Caudal to lung
- Cranial to kidney
- Follicular development occurs early
- Juvenile: appears like a brain
- Mature: appears like tapioca
T/F: All animal species have a corpus luteum after ovulation.
FALSE
Birds do not.
Name some key characteristics/events associated with the avian infundibulum.
- Fertilization occurs here
- Yolk membrane outer layer formed
- Sperm may sometimes be stored here
Name some key characteristics/events associated with the avian magnum.
- Longest section
- Where the majority of the albumin is deposited
Name some key characteristics/events associated with the avian isthmus.
- Calcification begins here
- Two shell membrane secreted
Name some key characteristics/events associated with the avian uterus.
- Shell gland
- Addition of water and electrolytes into egg
- Calcification occurs and finishes