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How to tell if an egg is fertile before incubation.

Sagot :

You'll only need to open 1 or 2 in the few days running up to your incubation. When you crack open the egg, if it's fertile, you'll notice a small white spot on the top of the yolk about 4mm in width. This is called the germinal disc. This is what tells you if the egg has been fertilised.