Right now, all breeds are separate, but doing experimental crosses between breeds. One I like so far is a Jersey Giant over a barred Rock, got a barred rooster with a black tail and speckled black and yellow legs. He grew to size MUCH faster than his JG sire. Planning on crossing him back over a JG hen, and seeing if I can keep the faster growth, and maybe developing a sex linked barred Giant?
Yes, the first generation will be JG/BR hybrids, but if I can successfully introduce the barring gene to the JG's, later generations should be autosexing (white spot on cockerels heads).