Pretty sure the spotting on the chest of the yellowy chested bird is from a pattern gene and is duckwing related and I think they call it Birchen/Duckwing and you want to try and loose that pattern gene as you're breeding, I had one in standard duckwing colors that came from Ann Charles breedings and lost the rooster to a dog attack, he was tufted and rumpless, I hatched all of the eggs I had collected and managed to get a partial tailed roo that was clean faced and is a golden duckwing with less of the pattern gene and a better comb size than the Rooster he came from.
The Blue Cuckoo is going to be sex linked and best to use a Black to breed with it to get the Cuckoo in the opposite sex of what it came from, if you have a pair of them it would be nice to see if they breed true, if not locate a solid black bird to use. I am guessing you would use a BBR with the Cuckoo to produce Crele. Gary did have Crele in his birds, I also got what is called Quail from his breedings, and I really liked the way that bird looked, started out as an all black chick then started getting what looked like Birchen coming in the neck that was white, then its chest started getting the white feathers coming into it and the chest feathers were white laced with gold, I have one hen left that is tailed and clean faced that goes back to Garys birds.
And you can use your BBR's with your Duckwings to get more Duckwings, so keep that in mind if you have a nice tufted and rumpless BBR hen.
For all of them you're striving for yellow skinned birds, the whites are supposed to have the yellow legs, most of the other colors have willow, however if you get yellow don't fret, you may in the next generation get willow and at least you know you have the correct skin color. Another easy way to check for skin color is look at the bottoms of the soles of their feet.
Victoria
