The myth about yolk color

A few thoughts on yolk color: We find our eggs' color varies with the season, and with the different paddocks that the chickens forage through.

Different patches of grass produce different color of egg yolk: lucern is the most orange, clover is bright yellow, phalaris grass produces lighter yellow.

There is also a difference between seasons, which depend on the rainfall and the balance between green matter and dry (sweeter) matter.

However, as the American Egg Association says, "Color has no relationship to egg quality, flavor, nutritive value, cooking characteristics or shell thickness".

http://www.incredibleegg.org/eggcyclopedia/c/color/