I see they have not just Heck Rind (which is not a bred back auerochs descendant at all - by any far length, and has a rather awkward tainted if not stained history), the exhibit holds what seems like konik horses (again not a true bred back descendant of the original European wild horses tarpan (but a Polish baron's personal domesticated domestic horse breed that just happens to be able to survive in the wild).
All the same, it is a nice zoo spectacle and makes for an interesting exhibit.