Birchen is on ER. Some are based on s+. (red) some on S (silver). So If your breeding to a black hen you can still get Solid black and birchen and brown reds (without any laceing on breast)... It depends on what allele there on... Is your birchien on red,silver.gold????

This roo if the pic came through is a brown red. No laced breast... He is s+... If he has silver on neck he is on S.....Thanks...Toni-Marie