How do you accomplish this? Do you base your breedings off of the extensive genetic, DNA and health work-ups a veterinarian has done on your animals? How many generations back do these work-ups go? I know that the very best and responsible breeders insist on at least a 7 generation pedigree with health testing but perhaps it's less in guinea pigs? Maybe 5 generations? I can't imagine it could be less then that to have a working understanding of the genetics and health issues. After all, these things don't reflect in spots, markings, coat quality or coloring. Well, except for satins and skinnies/baldwins. Their particular coats immediately give away the serious and underlying health issues.I breed to improve the condition and the quality of my breeds.
Those genetic markers and anomalies your testings have found, along with your vast comprehension of working genetics, would be crucial for any sort of breeding. Without it you would be blind to what you are actually doing and all you would have to base your breedings on would be looks and coloring! That would be ridiculous wouldn't it? Can you imagine someone being that irresponsible with living creatures?!