Laboratory Mouse Group Housing: Social Welfare in Research Animals

Mice are the most widely used laboratory animals, and the shift toward group housing represents one of the most significant welfare improvements achievable within current research frameworks.

Key Facts

Approximately 100 million mice are used in biomedical research globally each year
Mice are obligately social animals; single housing causes chronic stress measurable by cortisol levels
Individually ventilated cages (IVCs) can facilitate group housing while maintaining biosecurity
Enriched group housing reduces stress responses and improves physiological research baselines
Many research protocols still specify single housing for convenience rather than scientific necessity

Welfare Considerations

Mouse group housing is both a welfare imperative and a scientific improvement. Single-housed mice are chronically stressed, which alters the very physiological parameters researchers are trying to measure. Transitioning to group housing is therefore both the ethical choice and the scientifically rational one. Resistance from some research institutions reflects habit and protocol inertia rather than scientific justification. Regulatory agencies and institutional animal care committees play a crucial role in requiring group housing as a baseline standard.

What You Can Do

Support institutional animal care committees that require group housing for laboratory mice
Advocate for regulatory standards mandating social housing for mice in research settings
Support 3Rs organizations promoting refinements that improve mouse welfare in laboratories
Donate to alternatives research that reduces overall reliance on mouse models
Encourage researchers in your network to transition to group housing protocols