The stress of weaning in beef and dairy cattle suppresses immune function and increases disease susceptibility, and welfare-focused weaning protocols reduce these risks significantly.
The immunosuppression caused by weaning stress creates a welfare cascade: acute stress suppresses immune function, increasing susceptibility to respiratory and enteric diseases that then cause further suffering, treatment burden, and mortality. This cascade is not inevitable — it reflects management choices. Welfare-positive weaning protocols that reduce acute stress through gradual separation, pre-weaning vaccination, and nutritional support during the transition period significantly reduce immune suppression and its consequences. The economic case for welfare-conscious weaning is also compelling: reduced disease means lower treatment costs, better growth rates, and fewer calf deaths.