So glad I found this thread! We were experimenting on our own and just had a broody hatch out 3 Black Copper Marans roo over Cuckoo Marans hen crosses to test it out. So far they're a week old. Two hatched with big white spots and one hatched with a black head. They're feathering in with the expected barring & black feathers. Here is a question: In our other coop we have a Buff Orpington rooster and a Barred Rock hen. It seems that should also produce sex links. Correct? Would color would those chicks be? Thanks!