Did u hear about the cows over in Europe that they found had aurochs genes? Supposedly they can bring aurochs back from extinction.., by selectivley breeding this certain group. I mean they say it can happen in 10 to 15 years that's crazy, especially since the last one died when Shakespeare was alive in the 1400"s
They say this, but it remains to be seen if its true or not.
In order to bring back an extinct line you need to have a complete copy of its genome. Otherwise you're just making what might be termed an "artful fake".
They do now have a map of the Auroch genome, so that's a necessary first step, though not a sufficient one.
The only way you could re-create an Auroch using current cattle would be if every gene present in Aurochs is also present in current cattle. . .ie absolutely no Auroch genetic material was lost in the last 400 years during their extinction. Don't know if that's true, but its doubtful.
Of note, people have tried to recreate the Auroch this way before. It was done in the late 1920s and 1930s in a German project actually supported by Nazi Germany. The Nazis though that the "Auroch" (ie "original ox") would be a good symbol for their Aryan genetic "purity", and bringing back an extinct species would be a triumph of their science and genetics. Anyway, the scientists/breeders involved did create extra-large cattle, but they weren't really Auroch:
https://en.wikipedia.org/wiki/Heck_cattle
More info now should result in a better match, though it remains to be seen how close they can get.
In theory, even if some genetic material was lost, with good enough DNA/chromosomal modelling technology, it should be possible to directly recreate/synthesize an Auroch genome, either from scratch, or (more simply) by genetically altering "normal" cattle DNA, a la "Jurassic Park". But right now that sort of biotechnology is still the stuff of science fiction.