The Sayaguesa Cattle, also called Zamorana Cattle, is an ancient, aurochs-like cattle breed from Sayago in the province of Zamora in the Spanish autonomous community of Castile and León.
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In 2003 the back-breeding project Projekt Urokse ('Project Aurochs') was initiated in Lille Vildmose, in which a crossbred population of Heck cattle, Chianina and Sayaguesa was released under controlled conditions and is being bred and selected for heightened similarity to the extinct aurochs in both morphology (looks) and instincts (behaviour).