evolution and domestication of poultry Flashcards
1
Q
bird evolution
A
- transition from dino fuzz to flight feathers
- loss of teeth
- loss of tail
- fusion and modification of skeletal elements
- reduce body size
- outer cortex of bones thinner but more dense
- bones hollow or have trabeculae
- sternum larger; evolved central keel
- forelimbs longer
2
Q
domestic chicken
A
gallus domesticus
first domesticated from red jungle fowl (gallus gallus)
likely hybridized with grey jungle fowl
3
Q
why were chickens likely domesticated 8000 yrs ago
A
cock fighting
4
Q
first evidence of domestication from
A
china
5
Q
how do domestic chicken differ from wild jungle fowl
A
less active
fewer social interactions
less aggressive
increased body weight
mature earlier
more frequent and larger eggs
6
Q
when do broiler chickens reach slaughter weight
A
5-7 weeks
7
Q
we select for
A
rapid growth and enlarged breast muscles which causes skeletal malformation, dysfunction and leg deformities
8
Q
aus prefer
usa prefers
A
brown eggs
white eggs
9
Q
when does layer hen production peak
A
26 weeks
