

Why are chicken eggs different colors?

Contrary to popular belief, a brown chicken egg is not healthier than a white chicken egg.

Have you ever wondered why chicken eggs come in a variety of color—white, cream, brown, blue or green? Do the different colors impact the flavor or the health value of the eggs?


All eggs start out white in color; those that are laid in shades other than white have pigments deposited on them as the eggs travel through the hen’s oviduct. The journey through the chicken’s oviduct takes approximately 26 hours. The shell takes roughly 20 hour to be complete. Ameraucana birds have the pigment oocyanin deposited on the egg as it travels through the oviduct. This pigment permeates the egg shell resulting in the interior and exterior of the egg being the same blue color. Chickens that lay brown tinted eggs deposit the pigment protoporphyrin on the eggs late in the process of forming the shell. The pigment therefore does not penetrate the interior of the egg, but tints only the surface of the egg, which is why brown eggs are white on the interior. In the case of an Olive Egger, a brown pigment overlays a blue egg shell resulting in a green egg. The darker the brown pigment the more olive color of the resulting egg.

Other than appearance, there are no major differences between eggs from different breeds of chickens as noted on the University of Illinois Extension’s Incubation and Embryology site.

Consider sharing your chicken raising experience with youth. 4-H can provide a valuable opportunity to gain skills while working with young people. For more information about how to become involved, visit your county MSU Extension office or the Michigan 4-H Youth Development.

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