So I've been looking around for possible causes for uneven pigment/speckles on eggshells but can't seem to find anything that would explain why one of my buff orpingtons almost always lays specked or blotchy colored eggs. Is it possible that it's just a genetic thing? I've read that it could be from stress or poor nutrition but she has always laid these kinds of eggs since a little after she first started laying about a month or two ago. Everyone else lays normal eggs, it's just her. Here's a picture of her egg from today: Any ideas?
My guess would be genetic, too, or at least, some sort of defect somewhere like the shell gland. We get accustomed to those perfect looking eggs in the grocery, because the rest are used in other ways such as cooking.