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ummmm I am pretty sure all ameraucanas are recessive white, even the whites. One sure way to tell if is recessive or dominate is to breed to a black. Recessives will hatch black chicks(split whites) and dominates will produce white chicks when breed to blacks.
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I don't know who, for sure, added the dominate white to their Ameraucanas; but I found it in a bird coming from a cross of two major breeder's lines....................... along with genes for barring and slow feather in another.
This is where you lose me. If Mike Gilbert says Dom White covers all black, where would it be possible for a Dominant white to show black?
Dominate white is dominate, but leaky. So, crossed to black, you get a bird with one copy of dominate white and appear visually white but with some black leaking. Red shows to a much greater extent.