Well, not quite. But some of their DNA is. A paper just out in PLoS ONE has found two mitochondrial DNA haplogroups (the ones labelled R and P in the diagram below) which apparently got into Italian local breeds from “European aurochsen [haplogroup E] as the result of sporadic interbreeding events with domestic herds grazing in the wild.” Some of these breeds are rare and marginalized, though, so even the last remnants of the aurochs might be in danger.
