I have 6 hens and usually get 4-5 eggs per day. Probaly 30-40% of my eggs have some sort of blood in the yolks or in the whites. Its usually a string of blood across the yolk or a dark blood colored spot in the white. My wife usually throws them away when she cracks them. We sell some eggs and I dont really want to pass them on to my customers either. Should I change their feed? The girls have a 10x12 very clean coup. Fresh water daily and free range 8 hours a day.