"Blood spots are the result of broken capillaries in the reproductive system. When the capillary ruptures, a drop of blood leaks out and becomes part of the egg. The presence of a blood spot does not mean the egg is fertile or that an embryo is beginning to form. Egg processors attempt to identify and remove all eggs containing blood spots before eggs go into the carton." (For source click here).
Aparently blood spots are more common in older birds and the first eggs laid by younger chickens.
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