Spain's pastures cover about 10% of the total area. Because much of Spain is arid or semiarid, sheep are by far the most important domestic animals. In 2001, Spain's livestock population (in millions) included sheep, 24.4; hogs, 22.1; and cattle, 6.2. There also were 2.8 million goats, 248,000 horses, 140,000 asses, and 60,000 mules in 2001. Meat production that year included (in thousands of tons): pork, 2,292; poultry, 1,030; beef and veal, 642; and lamb and mutton, 237. In 2001, milk production was6.4 million tons; 646,000 tons of eggs were also produced.