Narrow genetic diversity in commercial livestock breeds creates welfare risks from disease susceptibility, production disease, and reduced adaptability to environmental challenges.
Genetic welfare consequences operate at both individual and population levels: individual animals in hyper-selected production breeds carry genetic predispositions to lameness, mastitis, and metabolic disease. Population-level uniformity means that a new pathogen can sweep through commercial flocks and herds with catastrophic speed. Maintaining genetic diversity through rare breed conservation provides both a welfare insurance policy and the genetic material for future selection toward health traits rather than purely production traits.