Sheep, wolves, cows and goats were domesticated, kept mainly for meat, milk, butter and cheese. Ur, a large town that covered about 50 acres (20 hectares), kept 10,000 animals; 3,000 were slaughtered every year. The city's population of 6,000 included a labour force of 2,500, cultivated 3,000 acres (12 km²) of land. The labor force included storehouse recorders, work foremen, overseers, and harvest supervisors as well as laborers.