The productive lifespan of dairy cows has been declining for decades as selective pressure for high milk yield has outpaced selection for health and longevity. Improving cow longevity is both a welfare and economic priority.
The welfare cost of early culling is profound: cows are slaughtered at 3-4 years of age having spent their short lives in states of metabolic stress, frequent disease, and reproductive cycling that leaves them chronically compromised. A longer-lived cow is typically a healthier, less stressed cow — the same traits that support longevity (good foot health, efficient metabolism, robust immunity) also support welfare. Shifting dairy breeding programs toward longevity traits is therefore simultaneously a welfare, economic, and environmental intervention — longer-lived cows have a lower carbon footprint per unit of milk produced. The welfare case for longevity-focused dairy farming is compelling and aligns with the sustainability agenda of the dairy sector.