how many do you have??? allot of major breeders breed male and female lines... the males with white on his breast will breed females with not enough white on there necks to make better females... use your males with to much black over females with as much white as u can to get better in the next generation...
im having trouble finding a silver duckwing that I would call good. I either get black in the hackles or to much black in the wing... or white in breast and tail.