In the early 1920s, Heinz Heck initiated a selective breeding program in Hellabrunn Zoo attempting to breed back the aurochs using several cattle breeds; the result is called Heck cattle.
Starting in 1996, Heck cattle were crossed with southern European cattle breeds such as Sayaguesa Cattle, Chianina and to a lesser extent Spanish Fighting Bulls in the hope of creating a more aurochs-like animal. The resulting crossbreeds are called Taurus cattle.Source: Wikipedia
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