So does anyone know why they have these spots, I get them and don't use a light. In the morning it gradually lightens in the coop. So can't understand. Not all of my Marans just a few. I got rid of one, not to long ago, because if she wasn't laying gross eggs, she was broody.
I did some research when it was happening in my flock and found the possible causes...
1.) Genetics...
2.) Age... either very young or very old layers can pass blood spots.
3.) Stress ... including sudden shocks like lights being suddenly turned on or off
4.) Diet
Must be age they are pullets and just started laying. The diet is fine they free range and get layena plus and they have no light system in coop, just the good old sun. It only happens with my Marans.