I gots nothing! Not really sure it matters. I know there was a lot of discussion on this thread about how to make the blackest birds with the green sheen which is what we want, rather than the purple or blue sheen that is not desirable, but I don't remember any of that talk revolving around chick down color. If the parent birds all have a nice green sheen, it will be interesting to see if you see a discernible difference in the adult plumage when it comes in....... I won't even make a guess....... unless it is the mean gene???? lol