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She needs a cuckoo roo in order for all the first offspring to be cuckoo. But the males hatched would be Heterozygous for cuckoo. Males would be (B/b) and females (B/-) There is a sex-linked dilution barring gene but I’ve never seen it because the barring in my cuckoos and barred rocks behave...

I’ve always understood cuckoo as barring. It’s the same gene with different names under different breeds. The three genes you want kept from the silkies probably are crest, silkiness, and feathered feet. Silkiness is recessive so you would need offspring to be homozygous for silkiness...