The good, the bad, the comfortable: a review of welfare practices and indicators based on the five domains model in farmed deer.

Increasing consumer interest in game meat has globally expanded wild animal farming, with deer being a prominent non-traditional species farmed in numerous countries. Consequently, methods for assessing the welfare of captive animals have been developed over the last few decades, and despite its limitations, the Five Domains Model has become one of the most popular practical tools for welfare assessment. Our review focuses on welfare indicators in farmed red and fallow deer, the primary deer species in European farms. Among 57 studies, the majority emphasized deer health and nutrition, neglecting aspects like behavior and mental state. Notably, a significant portion explored human-animal interactions, especially in deer transportation. Summarizing literature for each domain, we propose reliable physical, behavioral, and physiological welfare indicators for farmed red and fallow deer. This comprehensive approach addresses current research gaps and contributes to enhancing the overall well-being of farmed deer.