Wild deer populations face welfare challenges from chronic wasting disease, liver fluke, and other pathogens that cause prolonged suffering.
Wild deer with heavy liver fluke or parasite burdens experience progressive nutritional compromise from organ damage reducing absorption efficiency. Tick-borne diseases cause fever and systemic illness. Heavy ectoparasite burdens cause anemia and immune suppression. Population-level welfare problems are detected through carcass examination and body condition monitoring, enabling management interventions to reduce disease burden.