Equine laminitis of alimentary origin: an experimental model

Area of Science:

• Equine Medicine
• Veterinary Research
• Animal Physiology

Background:

• Laminitis is a significant cause of lameness and debilitation in horses.
• Understanding the acute alimentary form of laminitis is crucial for effective treatment and prevention.
• Previous models for inducing laminitis have limitations.

Purpose of the Study:

• To establish a reliable experimental model for acute alimentary laminitis in horses.
• To characterize the clinical and physiological changes associated with induced laminitis.
• To validate grading criteria for lameness severity in experimental laminitis.

Main Methods:

• Administration of a starch and wood flour gruel to induce acute alimentary laminitis in horses.
• Monitoring of vital signs, including packed cell volume, leukocyte count, total protein, arterial pressures, central venous pressure, heart rate, and rectal temperature.
• Grading of lameness severity using established (Obel) and newly defined criteria.

Main Results:

• Acute alimentary laminitis was successfully induced in 11 of 12 horses.
• Induced laminitis exhibited clinical and physiological signs comparable to naturally occurring cases.
• Significant increases in packed cell volume, leukocyte count, and total protein were observed.
• Physiological parameters showed increased arterial pressures, decreased central venous pressure, elevated heart rate, and increased rectal temperature.
• Lameness, graded using Obel criteria, reached grade 3 in most affected horses within 32-48 hours.

Conclusions:

• The starch and wood flour gruel model effectively induces acute alimentary laminitis in horses.
• This model mimics key aspects of naturally occurring laminitis, making it valuable for research.
• The study provides a reproducible method for investigating laminitis pathogenesis and evaluating interventions.