1. What are some
important facts
about embryology?

2. Important Facts About Embryology
Taught by Mrs. Ketterer
Hen clucking
____________ = a female chicken; makes a ______________ noise
Rooster
_____________ = a male chicken; crows (cock-a-doodle do)
_____________________________

3. hen
The _________________ lays the eggs.
A hen and rooster do not need to be together in order to produce
_____________
an egg. need or do not need
A hen ____________ produce an egg without a rooster.
can
can or cannot

4. In order for a hen to produce an egg, she must be at least ______
5-6
months old.
24
It takes about __________ hours and __________ minutes for
29
an egg to form from start to finish.
shell
The ___________takes the longest to form.
It takes about ____ hours!
20

5. The last thing that’s added to the shell before it’s laid is the ____________,
pigment
color white
which is the _________of the shell. Chicken eggs can be ______________,
brown blue green peach
______________, ______________, ______________, or _____________.
Araucanas

6. beak
Chickens do not have hands, they use their _______ to explore things.
teeth
A chicken cannot bite you because it doesn’t have any ____________.

7. Fertile
_______________ egg = an egg in which an embryo will grow
Infertile
_______________ 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,
rooster
the hen must mate with a __________.
Male cell joins the female
cell creating a fertile egg.

8. Embryo = the baby chicken growing and developing inside the egg
__________
Chick
__________= the baby chicken once it makes a hole in shell and hatches
21
It takes _______ days for the embryo to grow and develop into a chick

9. Two Types of Incubation:
Natural
______________ incubation = a hen sits on the egg to keep it warm
Artificial
______________ incubation = using an incubator to keep the eggs warm

10. During natural incubation, the hen helps to provide the 4 primary
needs of the embryo.
heat
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
humidity
creates _________________. The hen also brings back moisture from
the grass.
exercise
The hen provides _________________ by turning the eggs with her
feet, beak, or body about 99 times per day.
unpolluted air
The embryos also need _______________________. The embryos can
pores
breathe through tiny holes in the egg shell called __________. There are
6,000 8,000
____________ to _____________ in each egg shell!

12. The embryo has three sources of food in the egg:
yolk
1 - The main source of food is the ________________. It provides the embryo with
vitamins minerals fat
_________________, _________________, and _________________.

13. The embryo has three sources of food in the egg:
albumen
2 - The __________________ is also used as a food source for the embryo.
thick thin
There are two layers of albumen, ________________ and _______________. The
protein water
albumen provides _________________ and ________________.

14. The embryo has three sources of food in the egg:
shell calcium
3 - The third source of food is the ___________ . The embryo gets ______________
bones
from the shell to help build strong ______________________.

15. weaker
Toward the end of the 21 days, the egg shell will get ____________ because
calcium
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.
does not
During the 21 days, the egg ______________________ grow in size.
does or does not