The phrase “welfare” is derived from perfectly + fare, i.e., how very well (or dignified) an animal “fares” (travels) by life. How well is surely an animal capable to manage its biological capabilities in relation to its setting? A operate centered definition of animal welfare is given by Broom (1986): https://spencerhhulf.nizarblog.com/33422125/helping-the-others-realize-the-advantages-of-fresh-salmon-on-sale