(AP) — This undated image provided by New Mexico State University shows bulls being rounded up at the university's high altitude beef cattle research facility at the Valles Caldera National Preserve, N.M.
New Mexico State University's Top of the Valle research center at the preserve has teamed up with researchers from other universities to study bovine high altitude disease, an illness that costs the beef industry some $60 million a year. (AP Photo/Susan Montoya Bryan)