The presence of a white bar on a dark background is distinguishing sex-linked barring from Autosomal barring, another plumage pattern in chickens which is created by a black bar on a light color background (white/ beige or brown) as exemplified by the breed Egyptian Fayoumi [REF].
Male chicken of traditional sex-linked barred breeds like the Barred Plymouth Rock usually show much wider and clearer white bands than females of the same breed [REF].