Monday, May 24, 2010

Stages in Embryo Development

I found a really neat website that explains the stages of development in a chick embryo.  The info below is from the Mississippi State University Extension Service.

EVENTS IN EMBRYONIC DEVELOPMENT

Before Egg Laying:
Fertilization
Division and growth of living cells
Segregation of cells into groups of special function (tissues)

Between Laying and Incubation
No growth; stage of inactive embryonic life

During Incubation:

First Day
16 hours - first sign of resemblance to a chick embryo
18 hours - appearance of alimentary tract
20 hours - appearance of vertebral column
21 hours - beginning of nervous system
22 hours - beginning of head
24 hours - beginning of eye

Second day
25 hours - beginning of heart
35 hours - beginning of ear
42 hours - heart beats

Third day
60 hours - beginning of nose
62 hours - beginning of legs
64 hours - beginning of wings

Fourth day - beginning of tongue

Fifth day - formation of reproductive organs and differentiation of sex

Sixth day - beginning of beak

Eighth day - beginning of feathers

Tenth day - beginning of hardening of beak

For the remainder of the days, I'll post the development on that day's post.

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