This Crane Egg Fertile and Alive?
By Sara Zimorski, ICF
important part of captive breeding is finding out if eggs are fertile
(holding a living embryo capable of becoming a chick) and viable (a
living embryo is inside of the egg). Simple
tests help us know.
|We candle the
egg to determine if it is fertile. Candling means
holding the large end of the egg up to a strong light source while
in a dark room. If the egg is fertile, you'll see a small light area
at the large end of the egg, which is the air cell, and the rest
of the egg will be dark. It is dark because of the developing embryo.
What do you think it means if you see light all the way through the
egg? (If you said the egg is infertile, you are correct.)
egg in lukewarm water makes it easier to see even tiny movement
of the egg. Notice that a bit of the floating
egg is above the surface of the water; that's the air cell. We use
warm water so the egg stays warm.
also play the brood
a chick would hear from a parent. When an embryo is old enough
(probably around 20 days old) it can hear the sound and respond
the entire egg
will move. When an egg did not move, we learned it was no longer
alive or viable.