Transcript Slide 1

4-H Embryology
•Penn State
•4-H
•Responsibility!
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.
Page 19
What is Embryology?
Embryo + ology
What is Embryology?
Embryology = the study
of the beginning of life of
any living thing
Let’s talk about chickens…
Rooster = Male
Hen = Female
Pages 5-6
Key words:
•Ovary
•Oviduct
•Pigment
How long
does it take
for a hen to
make and
egg?
That’s the hen, what
about the rooster?
H
H
R
The hen produces this egg independently.
This egg has hen cells only.
This egg will not develop an embryo.
This is the type of egg you buy at the grocery store.
This egg is INFERTILE.
When hens and roosters are together they mate
and the hen produces this egg.
This egg has hen and rooster cells.
This egg will develop an embryo.
This is the type of egg in the incubator.
This egg is FERTILE.
The hen and rooster mate. Parent cells unite inside the hen. The fertile egg is formed.
Shell
Outer Shell
Membrane
Inner Shell
Membrane
Page 4
Air Cell
Albumen
Chalazae
Yolk
Germinal Spot
Small, white
4 x larger, tan, circle
Blastodisc -Infertile
Blastoderm - Fertile
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
Candling
Page7
4
The embryo looks like a spider.
Label:
Air Cell
Embryo
Blood Vessels
Yolk
Albumen
Shell
4
The embryo looks like a spider.
Label:
Air Cell
Embryo
Blood Vessels
Yolk
Albumen
Shell
Shell
Air Cell
Yolk
Homework:
Page 3 - reading
Page 4 - bottom
Page 5 – top
Page 13- Scientific
drawing
Embryo
Albumen
Blood Vessels