Bovine high-altitude disease causes 75,000 cattle deaths each year across the western United States. The illness is the bovine equivalent of human hypertension because it leads to high blood pressure in the arteries of cattle. Left untreated, it can lead to death. To help scientists understand this disease, more than 100 young Angus and Hereford bulls are enjoying a working vacation at 8,700 feet (2,652 meters) above sea level. For four months, the animals will leisurely feed on lush, high-meadow grass in northern New Mexico. Scientists monitoring the animals hope to determine a genetic cause. Do It! Scientists want to _________ cattle.