What causes eggshells to be different colors?

Eggshell color is primarily determined by the breed of the chicken. For instance, hens like the White Leghorn lay white eggs, while breeds like the Rhode Island Red produce brown eggs. The color of the eggshell is influenced by pigments deposited during the egg formation process in the hen's reproductive tract. Regardless of color, the nutritional value and taste of the eggs remain largely the same.