Salatin runs all three and puts pigs and chickens together in hoop houses. The cows are in their own barn in his operation. Seems to me you might ask Joel directly over at polyface farms. If anyone would know whether or not that is a viable option, I would think it would be him.
I suspect, but do not know, that cows are just too big and strong for hoop houses. But Joel is the kind of person who thinks these things through and tries stuff out. I would think he could give a pretty solid answer.
Let me tell you a story about a man named Jed. He made this tiny ad:
Tomatoes! Ha! Anyone can grow that. Amaze your neighbors, grow your own shirt!