Despite what many folks think, these red spots do not indicate a fertilized egg. They are caused by the rupture of a blood vessel on the yolk surface during the formation of the egg or by a similar accident in the wall of the oviduct. Less than 1% of eggs have blood spots. Most grocery store eggs with blood spots are removed but it’s impossible for even an electronic spotter to catch them all. As an egg ages, the yolk takes up water from the albumen to dilute the blood spot so a spot actually indicates that the egg is fresh. Both chemically and nutritionally, these eggs are fit to eat. Remove a spot with the tip of a knife if you wish. Source: University of Kentucky College of Agriculture in Lexington, KY (afs.ca.uky.edu)
Despite what many folks think, these red spots do not indicate a fertilized egg. They are caused by the rupture of a blood vessel on the yolk surface during the formation of the egg or by a similar accident in the wall of the oviduct. Less than 1% of eggs have blood spots. Most grocery store eggs with blood spots are removed but it’s impossible for even an electronic spotter to catch them all. As an egg ages, the yolk takes up water from the albumen to dilute the blood spot so a spot actually indicates that the egg is fresh. Both chemically and nutritionally, these eggs are fit to eat. Remove a spot with the tip of a knife if you wish. Source: University of Kentucky College of Agriculture in Lexington, KY (afs.ca.uky.edu)