Association of tracheal mucus or blood and airway neutrophilia with racing performance in Thoroughbred horses in an Australian racing yard

Salz, R. O., Ahern, B. J., Boston, R. and Begg, L. M. (2016) Association of tracheal mucus or blood and airway neutrophilia with racing performance in Thoroughbred horses in an Australian racing yard. Australian Veterinary Journal, 94 4: 96-100. doi:10.1111/avj.12422


Author Salz, R. O.
Ahern, B. J.
Boston, R.
Begg, L. M.
Title Association of tracheal mucus or blood and airway neutrophilia with racing performance in Thoroughbred horses in an Australian racing yard
Journal name Australian Veterinary Journal   Check publisher's open access policy
ISSN 0005-0423
1751-0813
Publication date 2016-04-01
Year available 2016
Sub-type Article (original research)
DOI 10.1111/avj.12422
Open Access Status Not Open Access
Volume 94
Issue 4
Start page 96
End page 100
Total pages 5
Place of publication Chichester, West Sussex United Kingdom
Publisher Wiley-Blackwell Publishing
Language eng
Formatted abstract
Objectives
To determine the variation of tracheal mucus scores, tracheal blood scores and transendoscopic tracheal wash (TW) cytology in a population of Thoroughbred (TB) racehorses and assess their association with racing performance.

Methods
A total of 220 endoscopic examinations were performed and TWs obtained from 155 TB racehorses. Samples were collected 60–120 min following gallop work. Tracheal mucus score, tracheal blood score and TW cytology were analysed and their association with racing performance assessed.

Results
Of the total examinations and samples, 194 from 135 horses fitted the criteria for inclusion. The overall prevalence of visible tracheal mucus was 2.5% (5/194) and of increased tracheal mucus was 0%. The prevalence of visible tracheal blood was 8.8% (17/194) and of increased tracheal blood was 4.6% (9/194). A total of 36% (70/194) of TWs contained elevated percentages of neutrophils and of these, 96% (67/70) occurred in the absence of any visible tracheal mucus. There was no significant association between tracheal mucus score or TW cytology and subsequent racing performance. There was a statistically significant association (P = 0.004) between increased tracheal blood scores and poor racing performance.

Conclusions
Visible tracheal blood seen after strenuous exercise in clinically normal TB racehorses was a risk factor for poor racing performance, but the presence of airway neutrophilia was not. No horses in this study were found to have increased tracheal mucus, so the association of increased tracheal mucus with racing performance could not be assessed.
Keyword Airways
Endoscopy
Horses
Inflammation
Racing performance
Tracheal wash
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Veterinary Science Publications
 
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Created: Mon, 27 Jun 2016, 21:13:30 EST by Benjamin Ahern on behalf of School of Veterinary Science