Nazi vision went far beyond the military conquest of European countries. In fact, the Nazis were obsessed with the idea of creating a perfect Aryan race not only of people but also of animals.
Their project was to resurrect the extinct animals that were in European primary forests. Goering and Himmler hired the best scientists of Germany to launch an extremely crazy program of genetic manipulation to change the course of nature itself.
The aurochs is one of the extinct animals that the Nazis tried to resurrect, the ancestor of the current breeds of cattle. This project was a failure as it was stopped at the end of World War II.