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Are buff silkies wheaten (eWh)? I had thought they might be eb.
Most are e^b, not e^Wh. Any with greyish undercolour are e^b; any with females that have more than a tiny amount of black are e^b
Pg on its own wouldn't cause much of a problem. Pg is not only carried by black based birds, it is sometimes found in buffs too. Particularly on a eWh bird, it wouldn't really show if Co & Db are homozygous, & melanisers aren't present.
From the F2 stage onwards one would need to go by selection. With so many genes being in buff there would be quite a few different phenotypes occurring. Not sure how well they show in silkies. With selection & culling it ought to only take a few years; I've done similar projects in Orpingtons.
I suppose much depends upon how far towards the isobel silkie one wants to go. The so called "porcelains" appear to be more of an intermediate stage. This ought to be a good bit easier to get to than the true isobel silkie.
The more black pigment in the bird, the more lavender, the more red (buff) pigment, the more isobel.