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Yes, if you use a Birchen Blue rooster over the Cuckoo hens...but only that direction....you can't take a cuckoo rooster over a birchen blue hen to get sexing. And yes 50/50 blue or black, male and female, with males cuckoo on blue or black. Blue cuckoos are really pretty, imho. LofMc

I just checked my answers with https://kippenjungle.nl/Overzicht.htm#kipcalculator Yep....black copper over cuckoo girls....barred boys, black base (I expect some red bleed through), all black girls (I expect red bleed through). Birchen is not dominant over barred, so, as I thought barring...

I'm going to take a stab at this, from some of my breeding experience with black copper marans and other breeds, some barred. (I'm breeding for easter eggers, not Marans breed standard). Your black copper with cuckoo girls will produce sex linking as the cuckoo/barred gene will follow the Z...