I am from Vt and it is my experiance that they don't mix real well. I have often seen a group of deer that are out in a corner of a meadow and when the cows move towards them they go off to the woods.

i've watched cattle and deer feed together numerous times. here in florida, alot of our management area's are bordered to cattle pastures.

I know they don't mind Llamas....

I dunno, but I know wild hogs can usually be found right next to cattle.