As a teenager, I worked at a meat processing plant. My job was to clean a place. I happened to come in when they were killing pigs. That wasn’t a pleasant sight.
The crews that went in to recover the dead called it the “Slaughter Pen”; the blood pooling in the crevasses reminded them of the drains at the slaughter houses in Chicago.
I can’t imagine what it smelled like. I have driven past pig farms- that was bad enough.