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I checked the calculator prior to asking, because in my mind, a black tailed buff columbian x lavender would only have produced blacks split to lavender. The calculator confirmed my thinking and gave me nothing but "black unicolor split to lavender" ? And when I calculated the F1's bred together, it gave many varieties, but none were white with black hackles/wings/tail.
If your bird Juan came from a bad buff x lavender, did your lavender also carry a pattern gene, or was it based on something other than extended black? Not trying to pick what you're saying apart - just trying to understand how this cross happened.
Listen, I don't have the bird, haven't for a long time. I don't breed for this color in silkies, don't really have an interest in doing so. I know what the bird was, and what he was out of. I looked it up a few years back, when I had the bird, and it worked out on the calculator then. All I know is the parents were a Lavender Silkie and a Black tailed buff silkie. I have answered all that i can on it. The Lavender could have had Redtailed Hawk in it's family tree for all I know. Unless you have the same line for 20 years you could have anything pop out. Did you ever wonder Why so many people get Partridge or Gray that are split Lavender? May be somewhere on the gene thread Lavender is linked to the "pattern" gene. Don't know all the answers, I'm not one of those genetic knowitalls that all seem to have landed on BYC. All I know is that I breed for the showroom, have hundreds of birds at one time, have seen the same results over and over again, most of which the experts on here disagree with. But guess what! When I walk outside, those impossable outcomes are looking at me. Sorry if this comes off as snippy, but all I tried to do was give some knowledge to a friend who was interested in this color. And since I had some info wanted to pass it on. I should have just pm'd and saved some headaches all around. Lesson learned!