Pharyngeal lymphoid hyperplasia in Thoroughbred racehorses in training |
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Authors: | D E AUER R G WILSON † S GROENENDYK † |
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Institution: | University of Queensland, St Lucia, Queensland 4067 |
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Abstract: | The prevalence of pharyngeal lymphoid hyperplasia in Thoroughbred racehorses in training was investigated using a fibre optic endoscope. Of the 70 horses examined, all but 8 showed evidence of pharyngeal lymphoid hyperplasia and the severity of the pharyngeal changes decreased with age. Two-year old horses had greater pharyngeal lymphoid hyperplasia (p less than 0.05) when compared to all other age groups. More horses (p less than 0.05) with Grade 3 or Grade 4 pharyngeal lymphoid hyperplasia experienced recent mild respiratory disease than did horses with Grade 2 or less pharyngeal lymphoid hyperplasia. None of the horses examined had a history of diminished racing performance although 30% had either Grade 3 or Grade 4 pharyngeal lymphoid hyperplasia. |
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