I have heard of that before and would have found that documentary interesting.
The aurochs (bos primigenius) was the wild ancestor of today's cattle and as I recall became extinct in the 1600s.
It was one of the animals depicted in the famous cave paintings of Lascaux in France. I wonder how that beef was?

It was a very interesting documentary, I think it was on the military channel. The theory used was to take all the characteristics of the aurochs (Thnx for the sp) found in modern cattle located throughout europe and breed them to regain the origin. They accomplished a look alike but not the original. With today's genetics maybe they could get closer to the actual animal.