Well I am not involved with cats as such - I own 3 but only one is a pedigree cat BSH who is neutered now. I have a strong view in dog cross breeding and really wanted to learn about how people feel about the same thing with pedigree cats. My opinion is that pedigree cats have been bred for years - healthy bloodlines and good temperaments should not be mixed with. I dont know what health tests etc should be done with cats - but am very willing to learn and very interested. I wouldnt want to mix breed if I had a pedigree cat myself - every breed has their own traits and temprement - their own unique way?? So why mix that? But as for anything else please ramble away - would be nice to hear from more cat breeders or exhibitors to really understand this subject.
But if I put it in terms of breeding a dog that requires certain health tests before breeding from and then going on to use an unhealth tested dog - I agree with what you say about contamination ( such a clinical word ) LOL