The average dairy cow in the UK is culled after 2-3 lactations - extending productive life reduces welfare harms from repeat culling and repeated transitions while improving sustainability.
Dairy cow longevity welfare has multiple dimensions. Frequent culling means cows experience the repeated welfare costs of transport, slaughter and replacement without extended time in a stable environment. Cows that develop the conditions causing culling - mastitis, lameness - experience welfare harm before culling. Extending productive life by reducing disease incidence through better management improves welfare throughout the cow's life rather than just at its end. The sustainability co-benefit of longer-lived cows - reduced replacement rate and lower carbon footprint per litre - aligns with welfare improvement and provides commercial incentive for improvement.