ORIGINAL: TomFromTheShade
I would just keep the fence pretty low. Deer can jump pretty high, but why make it hard for them? Cattle hardly ever jump more than 2 inches lol. It doesn't take much to keep them contained.
I you realy think a cow can only jump 2 inches then your full of it because a mature bull can easily jump 6 feet when he feel its neccesary. Good thing they don't feel its neccesary to often.