I think Daris could kill a cow in hand to hand combat. Think about it, the cow and Daris are probably both starving to death. Cows eat grass, Daris isn't grass. Daris eats cows (Daris, you're not a weirdy, right?), and that cow is a cow. The cow won't be aggressive towards our man Daris, Daris wins 9 out 10 times.
Also, cow's teeth aren't meant for cutting anything, just grinding up grass. It might be painful, but you could definitely put your fist down that cow's throat and strangle it.