Kine of Araw
The oxen that lived on the lands around the Sea of Rhûn were hardier and wilder than any others in Middle-earth. Legends claimed that they were descended from the cattle of the Huntsman of the Valar, Oromë himself, and so they were named the Kine of Araw (Araw being the Sindarin form of Oromë's name).
The Kine were famous as the quarry of Vorondil the Hunter, ancestor of the Ruling Stewards of Gondor. It was he who cut a horn from one of these beasts and fashioned a hunting-horn from it, which came to be carried by the eldest son of the Ruling Steward from Vorondil's time onward. The last heir to bear the horn was Boromir, who saw it broken in two in his battle with Orcs beneath Amon Hen.