Animal Welfare Science: Building the Evidence Base

Animal welfare science has transformed from philosophy to evidence-based discipline over 50 years. Continuing to build the evidence base is essential for improving welfare outcomes for all animals.

Key Facts

The modern animal welfare science movement began with Ruth Harrison's "Animal Machines" (1964) and the subsequent Brambell Report
The Five Freedoms framework (1979) established the first systematic welfare assessment approach
The Five Domains model (2020) updated this to include positive welfare states, not just absence of suffering
Validated behavioral and physiological welfare indicators now exist for many major species
Affective states (emotions) in animals are now studied directly using preference testing, cognitive bias assays, and neuroimaging
The field has expanded to cover fish, invertebrates, and insects — species previously excluded from welfare consideration

Welfare Considerations

Animal welfare science provides the evidence base that drives policy, practice, and public understanding. Without rigorous research, welfare interventions cannot be targeted effectively, regulations cannot be grounded in evidence, and claims about animal experience remain contested. The field's expansion to include fish and invertebrate sentience is progressively extending the circle of moral consideration to billions of additional animals. Supporting welfare science — through research funding, academic training, and evidence-based advocacy — is one of the highest-leverage interventions for improving animal welfare at global scale.

What You Can Do

Support universities and research institutes conducting welfare science research
Follow evidence-based animal welfare organizations (Animal Welfare Institute, UFAW, Compassion in World Farming)
Advocate for research funding agencies to prioritize animal welfare science
Make welfare decisions based on the best available scientific evidence rather than intuition or tradition alone