Egg & Feather
No it's not the name of a new pub, it's a puzzle! When I was involved in agriculture brown eggs came from brown hens. I know that sounds silly but it's true. The strains of hen which laid brown eggs happened to be brown with a lot of Rhode Island Red in their ancestry. Unless the genetics have changed radically I would expect it to still be true. The white feather on this egg suggests otherwise.
Incidentally brown eggs and white eggs are nutritionally the same, one just looks prettier than the other. Also brown eggs cost more to produce than white eggs. The hens that lay brown eggs are larger and so need more space and more food. As a result the farmer would get more white eggs for the same space and food as he/she does for brown. White eggs mainly end up in food production and catering as the public favour brown eggs.