The Prevalence of Laryngeal Disease in a Large Population of Competition Draft Horses

Authors

  • JEFFREY E. BRAKENHOFF DVM,

    1. Departments of Large Animal Clinical Sciences and Small Animal Clinical Sciences, Michigan State University, East Lansing, MI
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  • SUSAN J. HOLCOMBE VMD, PhD Diplomate ACVS & ACVECC,

    1. Departments of Large Animal Clinical Sciences and Small Animal Clinical Sciences, Michigan State University, East Lansing, MI
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  • JOE G. HAUPTMAN DVM, MS, Diplomate ACVS,

    1. Departments of Large Animal Clinical Sciences and Small Animal Clinical Sciences, Michigan State University, East Lansing, MI
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  • HOLLY K. SMITH BS,

    1. Departments of Large Animal Clinical Sciences and Small Animal Clinical Sciences, Michigan State University, East Lansing, MI
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  • FRANK A. NICKELS DVM, Diplomate ACVS,

    1. Departments of Large Animal Clinical Sciences and Small Animal Clinical Sciences, Michigan State University, East Lansing, MI
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  • JOHN P. CARON DVM, MVSc, Diplomate ACVS

    1. Departments of Large Animal Clinical Sciences and Small Animal Clinical Sciences, Michigan State University, East Lansing, MI
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Address reprint requests to Jeffrey E. Brakenhoff, DVM, Departments of Large Animal Clinical Sciences, Michigan State University, East Lansing, MI 48824. E-mail: brakenho@cvm.msu.edu.

Abstract

Objectives— (1) To determine the effect of age, height, weight, breed, sex, and specific use on the prevalence of idiopathic left laryngeal hemiplegia (ILH) in a population of draft performance horses; (2) to determine the association between tracheal mucus and laryngeal dysfunction, and the prevalence of exercise-induced pulmonary hemorrhage (EIPH) in a population of draft performance horses.

Study Design— Cross-sectional.

Animals— Draft horses competing at the 2005 Michigan Great Lakes Draft Horse Show.

Methods— Endoscopic examinations were performed on horses competing at the 2005 Michigan Great Lakes Draft Horse Show. Signalment, height, and weight were obtained from the owners and trainers.

Results— Belgian, Percheron, and Clydesdale horses (n=183) were studied. Prevalence of ILH was 35%. Horse height was significantly associated with the risk of ILH in Belgian and Percheron horses but not Clydesdales. There was a significantly different prevalence of ILH among the breeds such that 42% Belgians, 31% Percherons, and 17% Clydesdales were affected. Laryngeal disease was a risk factor for increased tracheal mucus. None of the horses had acute evidence of EIPH.

Conclusions— The prevalence of ILH in draft horses has increased or is higher in competition horses compared with previously studied groups. Tracheal and/or pulmonary inflammation may be more common in draft horses with ILH based on our findings that horses with ILH have more tracheal mucus than horses with normal laryngeal function.

Clinical Relevance— Selection pressure for large, taller, longer-necked horses may be responsible for a seemingly increased incidence of ILH in competitive draft horses.

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