Things You'll Need
- Bowl
- Clean sand or finch seed
- Candling light or bright LED flashlight
Instructions
Wait until 14 days have passed from the time the last egg was laid before candling eggs for fertility. There are two reasons for this; the vascular system will be well-developed and easy to see after 14 days, and the embryo is less likely to be disrupted by being moved at this point.
Use caution when removing the eggs from the nest box for candling. Tap the side of the box to encourage the parrot to leave the box. If the parent birds will not leave the box, it is best to wait until they come out on their own.
Carefully transport the eggs to a darkened room. Placing the eggs in a bowl of clean sand or finch seed will help prevent them from rolling around and being damaged while you are carrying them.
Position the egg and the candling light, or LED flashlight, in such a way that the light shines through the egg. You should be able to visualize the contents of the egg quite easily. If you cannot, then reposition the light and/or the egg until you can clearly see the air cell.
Examine the egg closely. At this stage in development, you should be able to see the vascular system within the egg. It will appear as a "spiderweb" of red blood vessels on the inner surface of the egg's shell. If the egg is infertile, you should be able to see a round, yellow yolk inside. A dark area, rather than a yolk, usually indicates a dead-in-shell embryo. Any hairline cracks should also be visible, and if the egg is fertile, these should be repaired by applying a thin coat of Elmer's glue.
Return the eggs to the nest, or artificially incubate, if they are fertile. In general, it is best to return infertile eggs to the nest as well to prevent calcium depletion from repeated laying in the hen. Dead-in-shell eggs should be sent to a laboratory for testing or discarded. They will decompose if placed back in the nest, potentially causing health problems for the other eggs.