When I was at Odious someone wrote into Farmers Weekly enquiring how many pigs could be housed in a well lit heated building of XYZ dimensions
My late father and his business partner once housed a couple of thousand very contented piggies in the buildings which had once been the domestic area at RAF Merryfield. Including the old Officers' Mess - which some said actually improved the standard of behaviour of the occupants. The space each pig had within which to trot around was very generous and they thrived in such a comfortable environment.