Intensive selection for production traits has dramatically narrowed livestock genetic diversity — preserving heritage breeds maintains both biodiversity and welfare-compatible genetics.
Heritage breed preservation intersects welfare and conservation in important ways. The intensive genetic selection that produced modern high-production breeds came with trade-offs in health, longevity, and welfare that heritage breeds did not undergo. A Dexter cow that produces half the milk of a Holstein does so while experiencing far fewer metabolic diseases and lasting significantly longer. A Berkshire pig grows more slowly but without the cardiovascular and musculoskeletal problems built into commercial genetics. Maintaining diversity of livestock genetics preserves options for future breeding that can improve welfare alongside production — and provides resilience against disease challenges to which monoculture genetics may be vulnerable.