A case of poor-doing cattle in a feedlot in the prairie region of western Canada was investigated. Clinical examination revealed mild to severe chronic ulcerative stomatitis. Histopathological examination confirmed plant material embedded within the lesions. Yellow foxtail (Setaria lutescens) was grossly visible in clover silage fed to the cattle. This case highlights the need to consider plant awns as a potential cause of outbreaks of ulcerative stomatitis.
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