Up until the past month when my rooster got older and started climbing on the girls, I have not had to deal with fertilized eggs at all. He was an accident I was hoping he was a hen.... anyways, I collect the eggs every day so they don't have time to sit and develop. But will all the eggs from now on have blood lump in them? Doesn't bother me, I just spoon it out, but for my friends who get eggs from me I'd like to know. I will probably send him to the gallows soon anyways because I don't want a rooster, but I keep him around in case I decide to try hatching my own sometime in the spring.