I grew up on a farm, I have worked in a slaughterhouse, as you call it and both a chicken and a turkey longhouse. Not very pleasant places by sight or smell. In the vast majority of cases the animals are fed well and killed as humanely as possible. I know where my meat comes from and know from first hand experience that I have seen, heard and smelled the inside of those places. You do understand that animal excrement does not smell any better than human excrement? I would agree with you that anyone not familiar with a rural lifestyle may indeed throw up upon visiting one of these places. They would have also thrown up when we were butchering a pig, a chicken or a steer at our place. No, I never felt guilty, well almost never. There was the time we butchered Charlie Brown, a White Charolais bull I hand raised. He was about 10 months old and weighed around 1600 pounds. Very gentle animal and loved to play push the other guy around with me and our Shetland Pony.