It really is a symbiotic relationship we've developed with the things we've domesticated (or that domesticated us)
Especially animals reserved for working instead of eating, because in those situations oftentimes the food being made with the work is shared between the symbiotes.
Depends on the situation, factory farming definitely, but for most natural raised situations I'd argue the animal's well being is like 99% of the work being done.
It's also a double-edged sword. The moment a domesticated species isn't useful enough for us, its numbers (and therefore genes) will decrease dramatically. Plenty of livestock populations may be reduced to a tiny size if artificial meat production becomes cheap enough, or if it's decided to be a necessity to fight climate change.