Over the last 10 years Swiss Braunvieh cattle with malformations of the pinnae have repeatedly been reported. Endoscopy revealed a shortened and thickened epiglottis and malformations of the arytenoid cartilage in some of these animals. In most cases the elastic cartilage was replaced by fibrocartilage and hyaline cartilage. The direct cause and pathogenesis of the malformations could not be determined.
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