Fertilized Eggs

[bigblueteach]

How do you know if a rooster has fertilized eggs

 

[Cheekychook12]

How do you know if a rooster has fertilized eggs

You can crack one of the eggs open to check for a bullseye white spot on it
This is a fertile one, an infertile one won’t have a clear bullseye

 

[BigBlueHen53]

Or you can incubate them for three to four days, then candle them to see if you see veins - signs of development.