Why not leave the cow DNA in there and see what happens? We would create our very own Taurens, as found in the World of Warcraft. We could raise them on the plains, teach them to respect the "Earth Mother" and then they'd "pwn" us for raping the land! It would be horrible, but they're sooooo cute.
Calum MacKeller, from the Scottish Council on Human Bioethics, says, "In the history of humankind, animals and human species have been separated ... you may begin to undermine the whole distinction between humans and animals ... if that happens, it might also undermine human dignity and human rights." Wait, did he just agree that the Taurens would "pwn" us?
[Update 1: Apologies to the Newcastle folk, you've been added]