Steve, could you find info on the chicken calculator? I couldn\'t.
I\'m sure I\'ve run it on the calculator, though not with lav added, and believe dominate, recessive, and a mix of both just called white are there. Yes, a bird could be white and either split or pure for lav under it. The trouble here are people interpreting \"100% unicolor white\" in reference to a cross of pure dominate white on black to mean the birds are visually pure white. My experience is that one copy of dominate white can and does allow black to leak a bit, and red a whole lot more.
Leghorns are dominant white, I don\'t think black leakage is a problem with the strains I have seen.
In my short experience, two copies of dominate white makes a very white bird; though I\'m not sure if the faint striping I observed in my CX\'s wing and tail feathers is a result of bleed through two copies. [It does fade back out for the most part]
I think there may be some confusion about whether certain birds are pure for dominate white, or visually white but carrying only one copy for it.
By the way, chickens can be BOTH dominant and recessive white, the two are not allelic.
Yes, judging by the chicks produced, an Ameraucana roo used in a project
was both.