Transcript The incredible egg - Ione Community Charter School

The incredible egg
Ione High School
Animal Science Class
2008-2009
What is an egg?
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Egg- the female germ cell.
The egg becomes the embryo.
What then are the eggs in which we
see?
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Avian egg- bird eggs.
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It includes the following:
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Shell
Shell membranes
Albumen
Yolk
Together they protect and nourish.
What are the parts of the egg?
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From Outside to inside:
1.
Shell- hard outer surface; calcium
1.
2.
Shell membranes- there are two one next to the shell, and
surrounding albumen, yolk.
1.
3.
4.
5.
Shell has pores to allow loss of CO2, moisture.
Known as Inner and Outer Membrane
Air Cell- air space between two shell membranes.
Albumen- egg white.
Yolk- true egg, if fertilized become embryo.
Parts of An Egg
How long does it take a hen to lay an
egg?
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Ovulation- release of mature yolk from the
ovary.
Infundibulum- recieves the yolk, about 15
minutes spent.
Yolk moves into magnum 50% of albumen is
added. Takes 3 hours.
Spends 1.5 hours in the Isthmus. Shell
membranes added.
How long does it take a hen to lay an
egg? Continued.
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Spends the next 21 hours in the Uterus.
Remainder of albumen is added.
Shell pigment also happens here.
Vagina- the fully formed egg enters cloaca
and is hard.
30 minutes after egg is laid process happens
again.
Takes about 24 to 25 hours for chickens.
Female Poultry Reproduction System
How long does it take an egg to hatch?
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Species
Chicken
Duck
Pheasant
Turkey
Geese
Days to hatching
21
33-35
23-25
28
29-31
Development of a Chick
What is incubation?
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Hatchlings are incubated in captivity.
Artificial means of keeping an egg warm until
hatching.
Done in an incubator- artificially heated
container.
Still-air incubator- air is not circulated.
Force-air incubator- has a fan to circulate air.
What are the different methods of
incubating eggs?
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Laying eggs in the incubator and turning
them by hand every day.
In vitro- incubating eggs without shell.
The incubator must be kept at a certain
temperature range 99 to 103 F.