Chicken Development

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Next week in lab, we are suppose to start chicken development. Therefore, I thought it would be good to read up on this topic so that I am prepared for lab. With only 31 days left until graduation, I hope that we have enough time to finish this lab since the chicken develops and hatches in 20-21 days.

I will assume that we will be keeping the fertilized eggs in the incubator. I guess a humidified incubator is best, but I don't know what kind of incubator is in the lab.

All of the information below is from Mississippi State Universities website. []


Before Egg Laying:
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

Thirteenth day - appearance of scales and claws

Fourteenth day - embryo gets into position suitable for breaking shell

Sixteenth day - scales, claws and beak becoming firm and horny

Seventeenth day - beak turns toward air cell

Nineteenth day - yolk sac begins to enter body cavity

Twentieth day - yolk sac completely drawn into body cavity; embryo occupies practically all the space within the egg except the air cell

Twenty-first day - hatching of chick

I also thought it would be interesting to read up on some interesting facts about chickens. This is what I found:
-the chicken is the closest living relative of the t-rex
-a chickens heart beats 280-315 times a minutes
-9 egg yolks have been found in one chicken egg

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This page contains a single entry by Heidi published on April 10, 2013 9:40 PM.

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