The incredible egg

1
The incredible egg

• Ione High School
• Animal Science Class
• 2008-2009

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.