Breeding for birchen.

[nicalandia]

My original thoughts on the subject were using silver duckwing and black could create birchen, but I then read that black is dominant and so is birchen. I appreciate all of your advice, I’m going to remove the SD rooster and replace him with the birchen for a few months, and monitor results.

Black + Wildtype will not give Pseudo Birchen. Black + Silver columbian is what gives Pseudo Birchen looking birds, but they don't breed true because the phenotype is achieved by E/e+ Co/co+ heterozygosity.