Are New Hampshire red roosters compatible with buff polish hens?
Don't know about roos but I had a hen. My advise around vaulted skull birds like gentle Polish is not to mix them with straight comb heritage breeds like RIR, NHR, Leghorns, Barred Rocks or Wyans that have a tendency to dominate and they do it by pecking on the heads of gentle breeds. Dual purpose breeds or layer breeds tend to be assertive to outright mean some of them and Polish IMO are a sweet gentle bird. But to each his own as people will do whatever they want to.