ANSWERS ABOUT ANCESTRY?
For as much as equine genetic testing has expanded over the years, one type of test isn’t available yet. “We don’t yet have a test that can tell us what breed or mix of breeds is in an individual horse,” says Kathryn Graves, PhD, of the Gluck Center at the University of Kentucky. “We would be very popular if we could offer this test, because we get requests for it several times each week.” The challenge is that many of our modern breeds descend from the same foundation stock, and researchers don’t yet have enough genetic profiles of individual horses of different breeds to be able to distinguish them. “While breed identification of purebred horses is more easily done, determination of breed contributions in crossbred horses is a far more complex problem,” says Cecilia Penedo, PhD, of the University of California– Davis. “Perhaps in the near future, this limitation may be overcome by careful selection of DNA markers for breed composition tests to become more informative and accurate.”