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I came across this thread and message just by chance. In the late 1990's, I had a laying flock that was a composite of Danish Brown Leghorns and Easter Eggers. Over a period of several years, I selected for a "somewhat" Leghorn type bird which layed blue eggs. The plumage colors were varied, but dark and light browns predominated. In year 3 or 4 I had a single combed hen which layed blue eggs. Obviously a chromosomal crossover had occurred, breaking the linkage between the pea comb and the blue eggshell gene. While I thought it was interesting, I did not really care one way or the other whether the combs were single or pea, so I made no effort to increase the frequency of single combed, blue egg laying birds. Eventually a job change caused me to move and I disposed of the entire flock.