Loss of genetic diversity in commercial livestock breeds creates populations vulnerable to disease, reducing resilience and long-term welfare outcomes.
Genetic diversity is a form of biological insurance. Highly uniform livestock populations are efficient but fragile — when new pathogens emerge or environmental conditions change, there is little genetic variation to draw on. Selective breeding in commercial lines has often inadvertently narrowed the gene pool while selecting for production traits, sometimes at the cost of health and welfare. Rare and heritage breeds, kept in smaller numbers, frequently show higher disease resistance, better reproductive efficiency, and fewer conformation-related health problems. Supporting rare breed conservation is therefore a welfare concern as well as a cultural and biodiversity one, and gene banks protect options that might otherwise be permanently lost.