FERTILE COCKATIEL EGGS FOR HATCHING.
Female cockatiels lay their eggs within one to two weeks of mating. Like many other types of birds, it’s not uncommon for cockatiels to lay one egg every other day until they have all been laid. There are usually between four and six eggs in each clutch.
If a male is present and a successful mating has taken place, eggs will be fertilized in the oviduct as well. Females can store sperm in their bodies for up to 15 days, making it possible for 1 entire clutch of eggs to be fertilized from 1 successful mating.
Eggs can be candled about 7 to 10 days after their incubation has begun to verify fertility and development of the egg. At that time you should see a web of tiny red/pink veins starting to become visible inside the shell.
On average, cockatiels incubate their eggs for about 18-20 days. This can vary by a couple of days in either direction and is usually no cause for concern.
Cockatiels usually don’t start incubating the eggs until after the second or third egg is laid, with a clutch averaging 4 to 6. Fertilized eggs will remain viable at room temperature for more ten days as long as the incubation process has not begun. They cannot interrupt the incubation process without killing the chick inside the egg.
Both male and female cockatiels share the incubation of the eggs and it is common to see both of them in the nestbox at the same time. Sometimes one bird will be sitting on the eggs and the other just sitting beside and sometimes each bird will incubate somet of the cockatiel eggs. When one bird is outside the nestbox eating, to relieve him or herself, to eat or drink or to bathe — the other will take over the incubation of the eggs.
The father does a lot of the egg incubation during the daytime when the hen eats and rests outside the nest box. The hen will incubate during the night, while the male usually sits outside the nest box guarding it.