And I answered you.
I was hoping to give a more broad answer, but since you are wanting to do this piecemeal, OK.
As a former hog producer I am going to answer your question specific to hog production as regards the room allowed animals .
When the talk is ‘animals quality of life’ you probably are thinking only of the sow (mother pig), and not the baby pig. Baby pigs get laid on, stepped on, crushed, injured, smothered and otherwise hurt when a sow is given too much room to move around, especially during and immediately following farrowing (giving birth). The newborn pig also has an easier time finding the udder when the sow is resting comfortably in the same location, and thus a much better chance of living.
There’s much more, let me know.