- Jun 15, 2008
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The only difference in a fertilized and unfertilized egg is the size of a tiny hardly noticeable white spot. The blood spots and such don't mean they are fertilized and have nothing to do with the rooster. However if you've had a roo around the hens can lay fertilized eggs for 3weeks after the roo is removed. That's not the cause of your problem though. The blood spots come from the hens. I would think illness and stress could increase the chance for blood spots and if they are young new layers the odds would be greater.