This rooster came out of a line of silver duckwing American Games (an old line of regular grey). Kept pure for many years, not polluted with red genes or other genes. Also pictured is his mother. Could someone help me figure out what mutation this is? His father had the typical silver saddle/hackle and black breast. The pair have produced a few sports over the past couple years similar to this but mainly typical silver duckwing looking birds. We have had this line for many years but only this pair produces the odd sports. It must be something recessive? Or a mutation? Because the parents look 100% SDW.