Modern dairy cows are often culled by age 4-5 after just 2-3 lactations, despite their natural lifespan of 20 years — extending productive life improves welfare while reducing the environmental and economic costs of replacement.
The high culling rates in conventional dairy systems reflect the welfare toll of high-production systems that prioritize short-term output over long-term animal health. Cows that develop mastitis, lameness, or reproductive problems are often economically rational to replace rather than treat — but those problems are often caused by management conditions that could be improved. Extended longevity programs reframe the economics: a cow that remains healthy and productive for 6-8 years requires fewer replacements, carries less environmental burden, and has experienced a better life than one recycled through the system every 3-4 years. Longevity is simultaneously a welfare goal and a sustainability indicator.