So you’ve got chooks and a rooster and you want some chicks. But how do you know if the rooster is doing his job?
The way to check eggs to see if they are fertile is called “candling”. Candling involves putting a bright light behind the eggs to see what is inside. It’s really easy to do and great to see if you’ve got chicks.
There are some particular detailed signs to look for at all stages of growth inside the egg, but at the later stages of development it is very easy. It is as simple as looking for a part inside the egg where light does not pass through. A growing fetus will be opaque while the reminder of the egg white and yolk will be translucent.
The image above is around 10-12 days since fertilisation. A egg will normally take around 18 days to hatch.