Supplementary winter feeding of wild deer is practiced by some land managers and conservationists, with contested welfare benefits and potential negative consequences for wild populations.
Supplementary deer feeding sits at the intersection of welfare, ecology, and disease management, with genuinely contested welfare implications. Individual deer that survive winter because of supplementary food experience a clear welfare benefit in that season. But population-level consequences — increased density leading to overgrazing, disease transmission, and habitat degradation — may reduce per-animal welfare across the population and harm other species sharing the habitat. Where chronic wasting disease or bovine TB is present, the disease transmission risk from feed station aggregation may create welfare harm substantially larger than the winter mortality the feeding prevents. Evidence-based deer management requires assessing these trade-offs rigorously rather than assuming that supplementary feeding always serves welfare interests.