the easiest wy to creating an Autosexing EE that lays Dark colored Gree eggs(olive egger) is to cross a green egger EE with a silver/golden cuckoo maran.. getting a golden or silver cuckoo maran is the difficult part, OR if you already have a barred EE project(I have seen one here) you can use that Barred EE and cross it to Black Copper marans, your first cross wont be autosexing, neither your second(keeping sex link barring and ER birchen and peacomb ofcourse)...
but say you mate your BC1(bat to parent one) with each other(BC1xBC1) at this tage you will get sex links, males will be much lighter than the females(at least homozygous barring males)
but say you mate your BC1(bat to parent one) with each other(BC1xBC1) at this tage you will get sex links, males will be much lighter than the females(at least homozygous barring males)