No, the egg color is not sexed linked. If you reverse it and cross a Oliver Egger rooster x a Copper Marans hen, the offspring will still lay either olive eggs or dark brown eggs, depending on whether the Olive Egger rooster gives a blue egg gene or a brown egg gene. The egg color of the offspring is not determined by the sex of the Olive Egger parent, but solely by which gene (blue or brown) the Olive Egger parent (whether it's the rooster or the hen) gives. Here is an easy way to visualize it. Blue egg gene X Dark brown egg gene=Olive egg. Brown egg gene X Dark brown egg gene=Brown egg. Hope this helps.
