I'm not convinced that the amount of white is always 100% random. I have no doubt that it is random a large percentage of the time, but I feel as though when I see whole clutches of piebalds they very often seem to have a similar degree of white.
I suspect that with intensive line breeding, one could "fix" the amount of white in a line to produce a primarily high or low white line. This is likely not done often, which is why the majority of pieds seem to produce both high and lows regardless of their degree of white ... But I do suspect that it could be done.
.... Of course, until I do a lot of breeding I can't prove it one bit ..... Which is yet another reason I need a whole lotta pieds
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