Mental Experiences in Wild Animals: Scientifically Validating Measurable Welfare Indicators in Free-Roaming Horses.
Authors: Harvey Andrea M, Beausoleil Ngaio J, Ramp Daniel, Mellor David J
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary The Five Domains Model provides a structured framework for assessing equine welfare by linking measurable physical and functional indicators (nutrition, environment, health, and behaviour) to their underlying mental and affective states. Harvey and colleagues conducted the first comprehensive systematic review to scientifically validate welfare indicators specifically applicable to free-roaming horses, examining evidence from physiology, neurophysiology and affective neuroscience that demonstrates causal relationships between observable indicators and the emotional experiences they reflect. Their work confirms that a robust range of measurable indicators—from body condition and gait parameters through to stress hormones and social interaction patterns—can be reliably assessed in wild horse populations and credibly linked to positive or negative mental experiences. For equine professionals managing or assessing horse welfare, whether in clinical, farriery, rehabilitation or performance settings, this synthesis provides scientifically grounded justification for using specific indicators to objectively grade welfare status rather than relying on subjective interpretation. Applying the Five Domains framework with these validated indicators offers transparent, defensible welfare assessment methodology that extends beyond confined populations to the more challenging context of free-roaming animals.
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Practical Takeaways
- •Use the Five Domains Model framework to systematically assess horse welfare by measuring indicators across nutrition, physical environment, health, and behavioral interactions, then infer mental state consequences.
- •Ensure any welfare indicator you use has scientific validation linking it to both physical/functional outcomes and measurable mental experiences, not just intuition or tradition.
- •Recognizing that mental experiences characterize welfare status means going beyond physical observations to understand the affective consequences (positive/negative emotions) of management conditions.
Key Findings
- •The Five Domains Model provides a framework to link measurable physical/functional indicators (Domains 1-4) to inferred mental experiences (Domain 5) in free-roaming horses.
- •Scientific validation of welfare indicators requires evidence of links between observable indicators and physical/functional impacts, plus demonstrated relationships between those impacts and mental experiences.
- •This review synthesizes scientific evidence validating a comprehensive range of welfare indicators measurable in free-roaming wild horses for the first time.
- •The Five Domains Model enables transparent and justifiable assessment and grading of welfare status in free-roaming horses.