Sheep are ruminant mammals typically kept as livestock. An adult female sheep is referred to as a ewe, an intact male as a ram or occasionally a tup, a castrated male as a wether, and a younger sheep as a lamb. One of the earliest animals to be domesticated for agricultural purposes, sheep are raised for fleece, meat (lamb, hogget or mutton) and milk. Ovine meat is called lamb when from younger animals and mutton when from older ones. Sheep continue to be important for wool and meat today.