Chickens do not need to be fertilized to lay eggs, but the eggs produced can not hatch into chickens, which are unfertilized eggs. So a chicken farm can only raise hens and harvest eggs. The eggs we buy in supermarkets are basically unfertilized eggs. By observing the inside of the egg through the light, we can tell whether the egg has been fertilized: the egg yolk with a milky tail is fertilized, and the egg without tail is not fertilized. You can also crack open the egg and directly observe the yolk to distinguish, but in that case, even if the yolk has a tail, it is absolutely impossible to hatch a chicken
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