Description: Beef breed calves grazing wheat pasture at the New Mexico State University Clayton Livestock Research Center in Clayton, New Mexico. Some of these calves are crossbred from Raramuri Criollo cows and improved beef breed sires, while others are a straightbred improved beef breed (Brangus or Angus). Raramuri Criollo cattle are one of 33 known biotypes of heritage Criollo cattle that exist throughout the Americas today. The Tarahumara communities of the Copper Canyon of Chihuahua, Mexico have raised Raramuri Criollo cattle in fairly isolated locations for close to four centuries. Raramuri Criollo cattle have undergone natural selection to adapt to the harsh and variable environment of the Copper Canyon while receiving minimal modern-day animal husbandry inputs. Brangus are an improved beef breed consisting of five-eighths Angus and three-eighths Brahman genetics. Angus are a beef breed of British origin.