The sad thing is this is all for a little bit of efficiency to get all the feces easily into a trough. Before most the cages could flat pack along walls so let pigs out for 15 minutes a day pack cages and run a front end loader up and down halls and hose it down. Housing 3-4 sows in a cage most likely one will get bullied a bit and produce some runts but acceptable losses to not treat an animal smarter than a dog like a meat factory.