Assessing the impact of draught load pulling on welfare in equids.
Authors: Bukhari Syed S U H, Parkes Rebecca S V
Journal: Frontiers in veterinary science
Summary
# Editorial Summary: Assessing the impact of draught load pulling on welfare in equids With approximately 112 million working equids globally generating income for 600 million people—many pulling loads exceeding 15,000 kg daily in brick kilns, mining, and agricultural settings—understanding the physiological demands and welfare consequences of draught work remains critically under-researched, particularly in developing countries where overloading, prolonged working hours, and poor handling are common. Bukhari and Parkes reviewed existing evidence on how stride characteristics, gait kinematics, cardiovascular parameters, and biochemical markers can be measured to assess loading adaptations and identify the limits of equine draught capacity. Their analysis highlights that heart rate variability, blood lactate and gas concentrations, and plasma cortisol levels all reflect the physiological stress of load pulling, whilst eye blink rate offers a practical, cost-effective field assessment tool for acute stress that has yet to be validated in working equids. The authors identify a critical gap: whilst individual physiological indicators exist, there remains no standardised, evidence-based protocol for determining safe draught loads specific to different equine species (horses, mules, and donkeys) or individual animals. For farriers, vets, and equine professionals advising on working equid management, this review underscores the need for standardised assessment frameworks that combine accessible indicators like heart rate and eye blink rate with objective gait analysis to establish welfare-conscious, species-appropriate working guidelines.
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Practical Takeaways
- •Monitor stride patterns and gait changes during work as early indicators of fatigue and overloading—animals that shorten stride or alter movement need immediate load reduction.
- •Use simple, observable stress indicators like heart rate and eye blink rate in the field to assess welfare in real-time; standardized thresholds for safe working loads are urgently needed.
- •Develop standardized evidence-based load limits for horses, mules, and donkeys to prevent welfare issues; current practice often exceeds physiological capacity without scientific guidance.
Key Findings
- •About 112 million working equids support 600 million people globally, with many pulling loads up to 15,000 kg per day in developing countries.
- •Stride characteristics, gait kinematics, and heart rate variability can reveal loading adaptations and identify loading limitations in draught equids.
- •Biochemical indicators (blood lactate, nitrogen, oxygen, CO2) and plasma cortisol levels reliably reflect the physiological effects of load pulling and stress.
- •Eye blink rate is proposed as a cheap, simple, and immediate non-invasive indicator of acute equine stress in load-pulling scenarios.