The gut microbiome profoundly affects animal health, immune function, and emotional state. Understanding microbiome welfare connections opens new pathways for improving farm and companion animal welfare.
The microbiome represents a newly understood dimension of animal welfare that connects gut health to emotional state, immune function, and behavioral resilience. Stress impairs microbiome diversity, which impairs immune function, which increases disease susceptibility, which causes further welfare harm — a cycle that welfare-positive environments can interrupt at multiple points. The welfare implication is that management practices improving emotional welfare (enrichment, social housing, reduced stress) likely also improve microbiome health and physical resilience, while practices causing stress (isolation, poor housing, rough handling) harm both psychological and physical welfare through the microbiome pathway. This bidirectional relationship makes welfare investment even more valuable than welfare-only framing suggests.