How do you tell a fertilized egg from an unfertalized egg?

Answer 1

To see the difference between fertilized and unfertilized eggs we can use a certain methods. In poultry industry, this process called candling. Basically in this process, we put the eggs in front of a certain light, so we can see through. We can practice this at home by using a bright flash light in a dark room. After we see through, the unfertilized egg's yolk will be seen as a dark round thing. But in fertilized egg's yolk, there will be some red thread like coming out from the yolk. This method can't be done directly after the egg is being layed. Usually we do this candling process after the egg is being kept in the incubator for 72 hours. I hope this help

Answer 2

The only way to tell is to keep it at 100 degrees for 21 days. If you get a baby, it's fertilized. If you don't get a chick, crack it open. Was a baby forming that died during the 21 days or is it a stale egg? If it's just a stale egg, it wasn't fertilized.

Answer 3

A fertilized egg will have a small white spot on the surface called the blastodisc, which is the beginning of the embryo. This spot is not present in an unfertilized egg. Additionally, a fertilized egg may start to develop dark veins as the embryo grows, which are not visible in an unfertilized egg.