Animals used in scientific research have significant welfare needs governed by the 3Rs framework, with ongoing efforts to reduce animal use and improve welfare for animals that remain necessary.
Research animals experience welfare harms ranging from minimal (observational studies) to severe (surgical experiments, tumor implantation, disease induction). The welfare justification is that knowledge gained benefits human and animal medicine in ways that outweigh the harm to research animals. This justification requires genuine effort to minimize animal numbers, maximize welfare during experiments, and replace animal use wherever possible. The reality of research animal welfare varies enormously - well-resourced facilities with committed welfare officers achieve high standards, while under-resourced operations may fall far short. Transparency and independent oversight are essential to meaningful progress.