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Embryo Development

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Embryo Development by Species

▪ Chickens:

▪ 21 Days

▪ Geese:

▪ 29-31 Days

▪ Turkeys:

▪ 27-28 Days

▪ Ducks:

▪ 28-35 Days

▪ Ostriches:

▪ 42 Days

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Days 1-3

▪ Development of embryo

▪ Appearance of blood island

▪ Blood vessels appear on yolk sac

▪ Heart visible

▪ Vertebrae column becomes visible

▪ Brain and head visible

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Days 4-5

▪ Embryo is completely

separate from yolk

sac

▪ Formation of

reproductive organs

(Sexual Division)

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Day 6

▪ Voluntary movement

begins

▪ Everything is present

▪ Organs

▪ Main division of

limbs

▪ Beak and egg tooth

starts

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Days 7 to 9

▪ Abdomen more

prominent

▪ Feathers begin to form

▪ Mouth opening

appears

▪ Embryo looks like a

bird

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Days 10-13

▪ Beak and bones

begin to harden

▪ Skin pores visible

▪ Digits completely

separated

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Days 13-17

▪ Claws and feathers

visible

▪ Small intestine taken

into body

▪ Begins to prepare for

hatching

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Days 18-20▪ Growth completes

▪ Yolk sac is drawn into body

cavity

▪ Embryo becomes a chick

when it:

▪ Breaks the amnion

▪ Starts breathing into air

cell

▪ Can be heard through the shell

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Day 21

▪ Chick hatches!!!