Читать книгу Pet-Specific Care for the Veterinary Team - Группа авторов - Страница 279

Several companies offer DNA testing to identify breed heritage for pets. Unfortunately, only a few companies have actually performed the research to do this kind of analysis accurately. There are several companies that run these tests based on limited published guidelines and produce spurious results. Another issue is that these tests were designed to answer the question, “If this dog descended from only purebred ancestors, what breeds were represented?” Most mixed‐breed dogs are not descended from purebred ancestors (except designer breeds) and come from multiple generations of mixed‐breed ancestors. In the majority of cases the testing will identify markers that are considered breed specific and label that breed as an ancestor. It is more likely that the tested dog's ancestor and the founding members of a breed shared a marker – not that the pet's ancestor descended from the breed. For example, several “hound‐type” mixed‐breed dogs will be identified as being descended from rare hound breeds such as American foxhound or blue tick coonhound when the testing is just identifying markers that are present in ancestors to hound breeds. Even genetic testing companies that have done extensive research into mixed‐breed testing will have conflicting results on the same DNA sample. These are “best‐guess” results based on each company's algorithm of estimating breed background.