I myself am confused as to what you are trying to say? To be honest with you I wouldn't try to breed for Nigger dogs as the dog himself has been dead and gone for years, I could be wrong but that seems like what you are planning to do. It will be a long road trying to breed long dead dogs concentrate on the dogs of today and build with them for a better tomorrow. Again don't understand what you are trying to get across but I wouldn't be worried about how many times Nigger is in your pedigree.