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Why are some egg yolks darker yellow?

Hen’s fed lighter color feeds like wheat and barley produce eggs with lighter color yolks.  Hen’s fed darker color feeds like green plants, corn and alfalfa produce eggs with darker color yolks. The yolk color does not indicate hen health or egg nutrition. The yolk color also has no relationship to egg quality, flavor, cooking characteristics or shell thickness. Learn more from the Egg Nutrition Center.