Equine laminitis of alimentary origin: an experimental model.
Authors: Garner, Coffman, Hahn, Hutcheson, Tumbleson
Journal: American journal of veterinary research
Summary
# Equine Alimentary Laminitis: Experimental Induction and Clinical Parallels Researchers sought to develop a reproducible experimental model of acute alimentary laminitis to better understand its pathophysiology and clinical presentation. Eleven of twelve horses were successfully induced into laminitis via oral administration of a starch and wood flour gruel, with lameness severity graded using Obel criteria; most horses (7/11) developed severe grade 3 lameness within 40 hours of dosing. Systemic responses mirrored natural disease, with significant increases in packed cell volume, leukocyte count, and total protein by 24–40 hours post-dosing, alongside consistent elevation in arterial blood pressure, heart rate, and rectal temperature, whilst central venous pressure decreased. This model's reproducibility and clinical fidelity suggest it provides a valuable tool for investigating the mechanisms linking alimentary overload to laminitic breakdown. For practitioners, these findings reinforce that acute grain overload constitutes a genuine veterinary emergency with rapid-onset systemic effects—the window between ingestion and severe lameness is narrow enough to justify aggressive intervention in suspected cases.
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Practical Takeaways
- •This experimental model demonstrates that high starch grain intake can reliably trigger severe laminitis within 32-48 hours, confirming the critical importance of controlling grain access and feed management to prevent acute laminitis
- •Severe lameness (Obel grade 3) develops rapidly; early clinical signs should prompt immediate investigation of recent feed changes or accidental grain consumption
- •Blood parameters (PCV, leukocytes, total protein) show measurable changes within 24 hours of laminitis onset, potentially aiding early detection and intervention
Key Findings
- •Acute alimentary laminitis was successfully induced in 11 of 12 horses (92%) using starch and wood flour gruel administration
- •Obel grade 3 lameness developed in 7 of 11 affected horses at 40 hours post-administration, with onset ranging from 32-48 hours
- •Packed cell volume, leukocyte count, and total protein increased significantly (P<0.05) at 24 and 40 hours post-administration
- •Systemic responses including increased arterial pressures, decreased central venous pressure, increased heart rate, and elevated rectal temperature occurred consistently within 56 hours