AbstractA distinction can be made between aesthetic or intuitive perception in holistic biology and in daily life, and reductionistic scientific perception based on the search for causal mechanisms. Going from our observations of animals in daily life to observations of animals in scientific experiments implies a transformation. Scientific experiments exclude all values that are important in daily life. For research on the concept of animal welfare it can be shown that excluding values is impossible as this issue lies too close to our daily experience. This means that the empirical and the moral domain of the concept cannot in fact be separated. And by means of the moral domain, background theories about man's relation to nature, about the ...