Fibrous osteodystrophy occurrence is reported in 38 Mangalarga Marchador horses raised on Aruana (Panicum maximum) pasture from a breeding farm in Paraná state. Clinical examination showed bilateral and symmetric increase in bones of face and an increase of volume at the radius distal portion. The radiologic analysis revealed bone density reduction in affected areas. Blood biochemist demonstrated high phosphorus levels in 24 animals (63%). Analysis of the pasture was performed and high levels of oxalate were found in the Aruana samples. It was concluded that the ingestion of Aruana, a pasture with high oxalate levels, was responsible for the appearing of fibrous osteodystrophy lesions in horses.
equine; fibrous osteodystrophy; oxalate; Panicum maximum; Aruana
