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I'm seeing predominately yellow shanks, so Barred Rock as Cuckoo Marans (from the Marans) is whitish-grey shanks (light to darker depending on line). It's always hard for me to tell in photos, but they looked barred to me rather than cuckoo as well. My thoughts LofMc

To OP: I stand firm on my barring/cuckoo as to 25% double barred/cuckoo males, 50% single barred/cuckoo male and female (equally), 25% all black females. And yes...some should be straight barring and some cuckoo, following who gets the fast feather growth gene. But as to my further musty...

@Ridgerunner Thank you for the clarification...I wasn't sure if the Cuckooing (which is the barred gene impacted by faster feather growth to make diffuse pattern vs barred) would impact the feathering to sexable. I've never bred a cuckoo with a barred (either direction). Do you have answer on...

Nope...just checked fast feathering and it is attached to the K locus on the Z chromosome, which means to you...your fast feathering cuckoo will show up in the double barred males (who receive the Z from mom) and the single barred males (who receive the Z from mom), if I quickly computed that...

Your Black Sex Link roo will almost certainly have only 1 barring gene as he is a hybrid (Barred Rock hen with often a RIR roo). You have a Cuckoo Marans hen with 1 barring gene influenced by her rapid feather growth which makes the bars diffuse or "cuckoo" That means between these two the...