I'm going to mildly disagre with my friend Curt. It is true that a calf could be consumed overnight, but they are the better choice, especially if you cover them with rocks or throw them in a crevasse, or pile several logs over the carcase. For me, the object is to make access a little difficult and make the bait last. You don't want to drag a full grown steer too far, but a calf is within reason. What I'm saying is, don't just dump it, put it where it will do the most good, and make them work for it.
In Africa, for example, they commonly tie off the leopard bait high in a tree. They don't want him dragging it off, and they want the obvious visibility factor in their favor.
Good hunting. LB