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Lethal gene maybe the wrong terminology. some hens just lay eggs that can't hatch. Most chicks can get through eggshells ok, though super thick eggshells might be genetic and you wouldn't want to use her for breeding.

I don't know much about them. If you use the byc search bar, you can find more information about it. since it's that hen specifically, there must be something genetically wrong that keeps the eggs from making it.

It could be she has some sort of lethal gene that keeps the chicks from making it all the way.