What are blood spots in eggs?
Also called meat spots, they are occasionally found on an egg yolk. Contrary to popular opinion, these tiny spots do not indicate a fertilized egg. Rather, they are caused by the rupture of a blood vessel on the yolk surface during formation of the egg or by a similar accident in the wall of the oviduct. Less than 1% of all eggs produced have blood spots. As an egg ages, the yolk takes up water from the albumen to dilute the blood so a blood spot actually indicates that the egg is fresh.