In the comment sections of an earlier post, I was provided with a link to a video showing the herd. I really enjoyed it - their proportions are aurochs-like, the heads are elongated and the bulls are well-built. The horns are not bad, in some cows they actually face slightly inwards.
I like the bulls in particular. They resemble the Taurus bull Lamarck from the Lippeaue a lot (which is not surprising since that one is half-Sayaguesa). If those cattle were the product of a "breeding-back" program, I'd probably yell joyfully how aurochs-like they are. The Sayaguesa at the Veluwe once again confirm my view that this breed is probably the most useful one currently used in "breeding-back" attempts. You get good proportions, size , skull, body shape and acceptable horns all in one. If their sexual dichromatism had the desired level, they would look really a lot like the aurochs already (and there are still red Sayaguesa cows).
As far as I know the managers of the Veluwe herd do not have intentions to breed them for a more aurochs-like apparence. But it would be well-suited. Adding larger horns with a slightly better curvature and more size and slenderness would result in pretty complete aurochs imitations. I would use Chianina and well-horned Heck cattle, therefore creating something like "Taurus cattle 2.0". Why? Both are easily available, and Chianina is certainly the best choice for adding size and slenderness (and some of them even have good horn shapes). The only breed that has as large and useful horns as well-horned Heck cattle are Watussi, and Heck cattle are certainly better adapted to cold climate and they have a way better colour and no fleshy hump and that huge dewlap.
Next post: A collection of photos of a lot of aurochs material by Markus Bühler.