The barring, gene, I have to admit, I don't know. The original hen was a feedstore chick. Because her barring was sharper, I assume her bars came from a barred rock, not cuckoo. Then that hen was in with a bunch of marans, cuckoo, copper black, birchen, blue cuckoo, blue copper, plain black, so I have no idea what roos are the "baby daddy" In this case. I just hatched what I could when I got her home and selected the best I could and went from there. I wish I had some well thought out master plan, with careful records to share with you, but it is not the case. Mystery hen, bred by several mystery roosters, bought as an afterthought on a buying mission of another breed entirely. I liked her so well I wanted more. Originally I wanted to try to make barred Ameraucanas, but I was shot dead in the water after my first post on their official breed site so i decided to go the other way as far as I could, the darkest egg possible so there would never be any mistake of what my birds were about, wich was ANYTHING BUT Ameraucanas.