Instead of barring, can penciling be used? For example, this last time I use my barred rock hens with my Welsummer roos, and got the identifiable white spot on the male offspring. Solid black female. Soon, I will be getting two penciled rock pullets. When bred to the same Welsummer roos, will they produce sex links?
No, it must be sex linked barring to get black sexlinks, penciling might look similar but it is totally different and not sex linked.