It's all started within an egg
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Infertile egg
(no development)
Day 1- day 2
Appearance of tissue development
Day 2- day 3
Heart beat and blood vessels clearly visible
Day 4
Eye pigmented
Day 5
Appearance of elbows and knees
Day 6-day 7
Appearance of beak and voluntary movement begins
Comb growth begins and egg tooth begins to appear
Day 8
Feather tract seen and upper and lower beak equal in length
Day 9
Embro starts to look bird-like and mouth opening appears
Day 10
Egg tooth prominent and development of toe nails
Day 11
Comb serrated and tail faethers apperent
Day 12
Toes fully formed and first few visible feathers
Day 13
Appearance of scale and body covered slightly with feathers
Day 14
Embryo turns head towards large end of egg
Day 15
Gut is drawn into abdominal cavity
Day 16
Feathers cover complete body and albumen completely gone
Day 17
Amniotic fluid decreases and head is between legs
Day 18
Growth of embryo nearly complete, yolk sac still outside embryo, and head is under right wing
Day 19
Yolk sac draws into abdominal cavity, amniotic fluid gone and embryo occupies most of space within egg (not in the air cell)
Day 20
Yolk sac drawn completely into body, embryo becomes a chick (breathing in air cell), and internal and external pip
Day 21
A complete chick (hatched and dried)
Sources: Cobb hatchery embryo development
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