Most of the brown eggs in the U.S. are produced by a type of chicken breed called Rhode Island Red or Plymouth Rock, while many of the white eggs are made by White Leghorn chickens, he says ...

Brown eggs often cost more than white eggs ... For example, one of the most commonly kept chicken breeds for egg production ...

Generally laid by white birds with white earlobes Common U.S. breed is White Leghorn chickens “For chickens that lay brown eggs, a pigment protein called protoporphyrin is added as the eggshell ...