Icelandic horses are often stabled in loose-housing systems, and to date this type of stabling has not been evaluated with regard to its potential impact on respiratory health. The objective was to assess if differences in management systems (eg, conventional stable, loose housing and pasture only) affect the degree of airway inflammation, evaluated by cytology of tracheal aspirate (TA) and bronchoalveolar lavage (BAL) fluid. In total, 84 Icelandic horses (aged 8.1±4.6 years) housed under three different management systems (conventional stables [n=29], loose-house systems [n=29] and pasture [n=26]) were included. Endoscopy including mucus scoring, TA and BAL was performed. TA and BAL cytologies were evaluated by performing both the total cell count (TCC) and the differential cell count (DCC). Significantly higher BAL neutrophil DCC (P=0.032, P=0.040) and TA TCC (P=0.007, P=0.028) were found for each of the two groups of horses with indoor access (conventional stable and loose housing) compared with the pasture group. Regardless of stabling environment, weak positive correlations were found between TA and BAL TCC (r=0.37, P<0.001), between TA TCC and TA neutrophil ratio (r=0.33, P=0.002), as well as between TA and BAL neutrophil ratio (r=0.39, P=<0.001). A larger proportion of horses with indoor access showed evidence of subclinical airway inflammation characterised by an increase in TA and BAL neutrophil ratios.
- airway inflammation
- bronchoalveolar lavage
- tracheal aspiration
- stabling environment
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Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Ethics approval Ethical approval for endoscopic procedures on horses was further given by the University of Copenhagen Large Animal Teaching Hospitals Ethics Committee. All data and samples from the client-owned horses were collected with the owners' permission as part of routine diagnostic evaluation.
Provenance and peer review Not commissioned; externally peer reviewed.
Presented at Preliminary results were presented as an abstract at the Veterinary Comparative Respiratory Society (VCRS) symposium, Edinburgh, Scotland, 7–10 October 2015.
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