the incredible egg presented to you by- mr. spaulding
TRANSCRIPT
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The incredible egg
Presented to you by-
Mr. Spaulding
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What is an egg?
Egg- the female germ cell. The egg becomes the embryo.
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What then are the eggs in which we see?
Avian egg- bird eggs.– It includes the following:
Shell Shell membranes Albumen Yolk
– Together they protect and nourish.
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What are the parts of the egg?
From Outside to inside:1. Shell- hard outer surface; calcium
1. Shell has pores to allow loss of CO2, moisture.
2. Shell membranes- there are two one next to the shell, and surrounding albumen, yolk.
1. Known as Inner and Outer Membrane
3. Air Cell- air space between two shell membranes.
4. Albumen- egg white.
5. Yolk- true egg, if fertilized become embryo.
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Parts of An Egg
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How long does it take a hen to lay an egg?
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.
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How long does it take a hen to lay an egg? Continued.
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.
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Female Poultry Reproduction System
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How long does it take an egg to hatch?
Species Days to hatching
Chicken 21 Duck 33-35 Pheasant 23-25 Turkey 28 Geese 29-31
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Development of a Chick
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What is incubation?
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.
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What are the different methods of incubating eggs?
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.