From what I've read on breeding threads, *intentional* tracked breeding of father to daughter or granddaughter is fine. Brother-sister is the usual to avoid. If you do intend to hatch from your own stock, you might want to look up either the Jersey or Cochin threads and ask about line breeding. If you just do "flock" breeding, you can use the same rooster until he's too old, but if you want to see improvements, definitely try to keep one or 2 of the best cockerels from your hatches, if they are at least as good, or better, than the dad. Those would be best mated over their mothers, though since obviously all the ladies their age are at least half sisters, so you would need SOME way of tracking who is who; 'cause then you might get away with half brother over half sister, for a while. Or, if you have a clean, trustworthy breeder to get a new cock bird from, go that route every few years. My 2 cents distilling to the best of my ability all the advice I've been given over on the Heritage Rhode Island thread...