 Sheep herding has been one of the main economic activities and lifestyles of Mongolians for millennia . Mongolian sheep herding traditions and modern science are well developed . Mongolian selection and veterinary science classifies the sheep herd of the country by ( i ) wool fiber ’ s length , thinness and softness , ( ii ) capability of surviving at various altitudes , ( iii ) physical appearance , tail form , size , and other criteria . The most common sheep breeds are Mongol <unk> , Gov @-@ altai , <unk> , Bayad , <unk> , <unk> and number of other breeds , all being of the fat @-@ tailed breed . 
