When male yaks grow in an unpolluted alpine zone at an altitude of 4,200 meters, the growth conditions are in full compliance with the requirements of green food. The yak meat is extremely rich in nutrients, containing 24.69% protein and 1.33% minerals. Its red blood cells and hemoglobin are 50-100% higher than yellow cattle. Its nutritional value is higher than that of yellow cattle, and only blood red protein is 50% higher than ordinary yellow cattle.