The following info & so much more can be found at http://www.publix.com/wellness/notes/Display.do?id=Food_Guide&childId=Eggs
"The color of the egg’s shell is a reflection of the breed of hen. Breeds with white feathers and ear lobes, such as White Leghorns, lay white eggs. Those with red feathers or ear lobes lay brown eggs. White eggs are in high demand among most American buyers, but in certain parts of the country, particularly New England, brown shells are preferred. Breeds that lay brown eggs include the Rhode Island Red, New Hampshire, and Plymouth Rock varieties."