I dont know where are you from but I visited a pig farm near where I live and they are in really clean spaces because they grow faster, and also regulations.
That's not how it works. The space being "clean" doesn't really help much. Consider the transport and killing, and also the fact that by far the largest number of animals killed for meat (excluding fish) are factory-farmed chickens and chicken factory-farming always looks the same
Chicks for example. I don't say it's not clean, but this is how industrial scale production looks like.