1. 4-H Embryology
Week #2

2. 4-H Pledge I pledge my Head to clearer thinking
my Heart to greater loyalty
my Hands to larger service
and my Health to better living
for my club, my community
my country and my world.

3. Shell
Albumen
Outer Shell Membrane
Chalazae
Inner Shell
Membrane
Yolk
Air Cell
Blastodisc
= Food Source

4. Thick Albumen
Thin Albumen
Chalazae
Shell
Blastodisc
Yolk
Page 5
(Read Pg 3)

5. HOMEWORK
Which egg is fertile?

6. Incubation
Natural Incubation: the hen sits on the eggs until they hatch.
Artificial Incubation: use an incubator and copy the hen’s actions
until the eggs hatch.
4 Components of Incubation:
Temperature
Humidity
Exercise
Clean, fresh air
Page 3

7. 5/8/12 20
5/26/12…??
5/29/12
Page 11 7

8. The color of the shell is brown.X
Complete
Sentences!
Spelling
Always Counts!

9. Complete
Sentences!
Spelling
Always Counts!
Page 12

10. Individual Egg Progress

11. Temporary Organ Sheet (tan)
Internal = ?
External = ?

12. Temporary Organ Sheet (tan)
Internal = inside
External = outside

13. Temporary Organ Sheet (tan)

14. Temporary Organ Sheet (tan)
Temporary = for a short time,
not forever, not permanent

15. Temporary Organ Sheet (tan)

16. Temporary Organ Sheet (tan)
Organ = a group of tissues
which perform a certain task.

17. Temporary Organ Sheet (tan)
Temporary Organ = a group of tissues
performing a certain task for a short
period of time
Is a temporary organ internal or external to an embryo’s body?

18. Temporary Organs Protection Protection -Calcium Protection Egg tooth
Two Functions
Respiration (lungs)
Waste receptacle
Protection
Protection
-Calcium 19 - 21
3 day air supply
Food source
16 day supply
Protection
Main food source
21 day supply 18

19. What did you see when you candled on Day #4?
Page 13 Scientific Drawing:
Yolk = dark orange
Albumen = light yellow
Embryo = red
Blood vessels = red
Air cell = white (penny – nickel size)

20. Page 8

21. 8
Down feathers are starting to form, the embryo can open and close its mouth.
Homework
Pg 6- Read and
complete
Pg 11/12-
Answer questions
Pg 12- Chart
(fertile/infertile)
Page 15
Temp. Organ
Sheet (tan)- Read
the back
Pg 13- Scientific
Drawing
Shell
Eye Spot
Air Cell 8
Albumen
Embryo
Blood
Vessels
Yolk
Page 13