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Im new at incubation and i just have a quick question . I havent put any eggs in the incubator yet but i have candled sum of my eggs and they have black spot at the end "not the pointy part of the egg but the dull part" i was wondering what that is ? Is it fertile or infertile

Im new at incubation and i just have a quick question . I havent put any eggs in the incubator yet but i have candled sum of my eggs and they have black spot at the end "not the pointy part of the egg but the dull part" i was wondering what that is ? Is it fertile or infertile