The concentration of livestock production in a few high-performance breeds has reduced genetic diversity, creating welfare vulnerabilities from hereditary disease, environmental sensitivity, and reduced adaptability.
Livestock genetic diversity loss is a welfare risk operating across multiple timescales. In the short term, high inbreeding in production breeds increases hereditary disease prevalence. Medium term, reduced genetic adaptability limits the ability of breeding programmes to respond to changing welfare challenges including climate adaptation. Long term, the loss of locally-adapted breeds eliminates genetic material shaped by centuries of natural selection for robustness and disease resistance. Rare breed conservation programmes preserve this diversity as biological insurance. Integrating diversity metrics into mainstream breeding programmes protects both welfare and long-term genetic resilience.