High-yield dairy breeds produce extraordinary quantities of milk but face metabolic stress and health problems that limit their productive lifespan and welfare. Breed selection offers a path to improvement.
The dairy breed selection question is a welfare issue that plays out over millions of individual animals annually. High-yield genetics that prioritise milk volume over health traits create cows that experience their peak productive years in a state of metabolic stress, requiring intensive management to prevent the diseases that predispose them to early culling. The welfare cost is both direct — through mastitis, lameness, and metabolic disease — and indirect, through shortened productive lives that mean cows are slaughtered before they reach their behavioral prime. Breeding programs that include health traits — fertility, somatic cell count resistance, foot health — alongside yield can gradually shift the genetic trend toward longer-lived, healthier animals. Consumer preference for welfare-certified dairy that tracks herd longevity creates market incentives for producers to prioritise these traits.