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The incredible egg

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Shell membranes- there are two one next to the shell, and surrounding ... Development of a Chick. What is incubation? Hatchlings are incubated in captivity. ... – PowerPoint PPT presentation

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Title: The incredible egg


1
The incredible egg
  • Presented to you by-
  • Mr. Spaulding

2
What is an egg?
  • Egg- the female germ cell.
  • The egg becomes the embryo.

3
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.

4
What are the parts of the egg?
  • From Outside to inside
  • Shell- hard outer surface calcium
  • Shell has pores to allow loss of CO2, moisture.
  • Shell membranes- there are two one next to the
    shell, and surrounding albumen, yolk.
  • Known as Inner and Outer Membrane
  • Air Cell- air space between two shell membranes.
  • Albumen- egg white.
  • Yolk- true egg, if fertilized become embryo.

5
Parts of An Egg
6
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.

7
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.

8
Female Poultry Reproduction System
9
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

10
Development of a Chick
11
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.

12
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.
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