I imagine hitting a cow might be akin to hitting a moose only cows are more likely to travel in groups.

deadcatwithaflamethrower:

…No, a car can hit a cow and people can live, though the cow may need to be put out of its misery.

A semi-rig can hit a moose and the moose will shake its head, confused, before going back into the woods. In the meantime, the semi-rig is a flaming totalled wreckage on the side of the interstate.

Moral of the story: You do not want to hit a moose with any vehicle, ever, unless you are hitting a moose with the Death Star.