I would not pen them together. How will you control the feed for each? Sheep cannot have some of the minerals that hogs need and so on.
Also what is the first thing a bovine does when it stands up? It deficates. And if it is fed corn the hogs will be after it. So a hog learns to agrivate a calf untill it gets up so it can have it's meal. So calf is always pestured and does not gain well.