The incredible egg

Presented to you by Mr. Spaulding

What is an egg?

 Egg- the female germ cell.

 The egg becomes the embryo.

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.

What are the parts of the egg?

 1.

From Outside to inside: 1.

Shell- hard outer surface; calcium Shell has pores to allow loss of CO2, moisture.

2.

3.

4.

5.

1.

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.

Parts of An Egg

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.

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.

Female Poultry Reproduction System

How long does it take an egg to hatch?

 Species  Chicken  Duck  Pheasant  Turkey  Geese Days to hatching 21 33-35 23-25 28 29-31

Development of a Chick

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.

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.