Sum it up!

What are some important facts

about embryology?

Important Facts About EmbryologyTaught by Mrs. Ketterer

____________ = a female chicken; makes a ______________ noise

_____________ = a male chicken; _____________________________

hen clucking

rooster crows (cock-a-doodle do)

The _________________ lays the eggs.

A hen and rooster _____________ to be together in order to produce an egg. need or do not need

A hen ____________ produce an egg without a rooster. can or cannot

hen

do not need

can

In order for a hen to produce an egg, she must be at least ______ months

old. It takes about __________ hours and __________ minutes for

an egg to form from start to finish. The ______________________

takes the longest to form. It takes about __________ hours!

5-6

24 29

shell

20

The last thing that’s added to the shell before it’s laid is the ____________,

which is the _________of the shell. Chicken eggs can be ______________,

______________, ______________, ______________, or _____________.

pigment

color white

brown blue green peach

Araucanas

Since chickens do not have hands, they use their _______ to explore things.

A chicken cannot bite you because it doesn’t have any ____________.

beak

teeth

_______________ egg = an egg in which an embryo will grow

_______________ egg = the type of egg that you buy at the grocery store; an egg in which no embryo can grow

In order for a hen to lay a fertile egg,

the hen must mate with a __________.

fertile

infertile

rooster

__________ = the baby chicken growing and developing inside the egg

__________= the baby chicken once it makes a hole in shell and hatches

It takes _______ days for the embryo to grow and develop into a chick

embryo

chick

21

Two Types of Incubation:

______________ incubation = a hen sits on the egg to keep it warm

______________ incubation = using an incubator to keep the eggs warm

natural

artificial

During natural incubation, the hen helps to provide the 4 primary needs of the embryo.

The hen provides ___________ by sitting on the eggs.

The hen’s body temperature is very hot. Because the eggs are cooler than the air around them, water vapor in the air starts to condense. This creates _________________. The hen also brings back moisture from the grass.

The hen provides _________________ by turning the eggs with her feet, beak, or body about 99 times per day.

The embryos also need _______________________. The embryos can breathe through tiny holes in the egg shell called __________. There are ____________ to _____________ in each egg shell!

heat

humidity

exercise

unpolluted airpores

6,000 8,000

The embryo has three sources of food in the egg:

1 - The main source of food is the ________________. It provides the embryo with

_________________, _________________, and _________________.

yolkvitamins minerals fat

The embryo has three sources of food in the egg:

2 - The __________________ is also used as a food source for the embryo.

There are two layers of albumen, ________________ and _______________. The

albumen provides _________________ and ________________.

albumen

thick thin

protein water

The embryo has three sources of food in the egg:

3 - The third source of food is the ___________ . The embryo gets ______________

from the shell to help build strong ______________________.

shell calcium

bones

Toward the end of the 21 days, the egg shell will get ____________ because

the embryo is using the _____________ in the egg shell for food. This will

help the embryo to get out of the shell once it has developed into a chick.

During the 21 days, the egg ______________________ grow in size. does or does not

weakercalcium

does not

Magic School Bus-Crack a Yolk-Embryology This video approximately 25 minutes viewing time.  Show after the first lesson.  Great video for grades 3-12  Turn data projector on firstConnect your computer to data projectorLink:•Internet: Type or copy: http://sqooltools.com/edvideos/msb/index.html•Magic School Bus Video site: Topic: click on animals•Open : click on MSB: “Cracks a Yolk”•Click on the triangle to start video•Click on the icon: black with 4 arrows: this will enlarge to full screenJo-Ann Ketterer 4-H Embryology Program AssistantBerks County Agricultural Center 1238 County Welfare Road Suite 110 Leesport, PA 19533-9709 610-378-1327 FAX: 610-378-7961