What do you mean by "another color trying to pull through" ?
How difficult is it to breed the yellowing out of your flock? How dominant is whatever causes it, if it's not feed related?
Kim
At first I thought that the yellowing I was seeing in the roos was a feed and/or sun issue, but it appears to be more than that. Walt mentioned that it appeared to be was another color. I took that as if it was a problem I needed to work on...something bigger than an environment problem. I am assuming that it could be worked out by selecting roosters of good type with lesser amounts of this coloring, but I don't know.