Eggs which have been fertilized, can be incubated and developed into chicks, as long as the eggs are not refrigerated. Nearly all commercially produced eggs are laid by hens which have not mated with a rooster, so are not fertilized.
Fertile eggs are no more nutritious than nonfertile eggs, do not keep as well as nonfertile eggs and are more expensive to produce. Although fertile eggs may contain a small amount of the rooster’s male hormone, scientists believe it’s more likely that the hormone dissipates. Some ethnic groups consider fertile eggs a delicacy.
– See Germinal Disc