In 2001, Nepal had an estimated 6,983,000 head of cattle, 3,624,000 water buffalo, 851,000 sheep, 6,478,000 goats, and 912,000 hogs. Modern poultry farms are operated principally by the Newaris, who carry on most of the agriculture in the Kathmandu Valley. There were about 9.8 million chickens in 2001, when 13,500 tons of poultry meat were produced. Traditionally, butter and cheese are among the leading exports of Nepal. Livestock products in 2001 included an estimated 342,000 tons of cow's milk, 20,000 tons of butter and ghee, and 614 tons of wool (greasy basis).