I have a 5 stall horse barn and only have 2 horses right now. The stalls are gravel floored. Was wonderin if I could raise a couple of pigs on this. What damage should I expect? The stalls are well packed as horses were using them before. I bed with sawdust and planned on using rubber pans for feed. Is there anything I can put on the gravel to control smell (ie - lime)? How long does it usually take to get them to butcher weight and what is the recommended weight? Thanks in advance.