I think grown deer can hold their own against a yote. Like Zach said though, even grown deer don't want to hang around too close when one is in the area. I have heard of turkeys fighting off a single yote and I even witnessed a cow charge at a single yote. The problem comes in when the yote is with some of its buddies or the deer a single yote is after is a sick deer or a young fawn. Last month I actually found a young fawn that fell prey to a yote. Its sad but its nature I guess. All I know is every chance I get I am taking a yote out.