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A neurological syndrome in dairy cattle associated with consumption of moldy beer residues is described. The disease occurred on 1 farm in late June 2001, during winter. Six heifers and 1 cow out of 45 cattle were affected during a 3-week period. The affected animals died spontaneously or were euthanized approximately 2-14 days after the onset of clinical signs. The clinical signs were characterized by flaccid paralysis and gait abnormalities. Clinical signs were more pronounced after exercise and included stiff and unsteady gait, knuckling at the fetlocks of the hind limbs, frequent falling, inability to rise, muscular tremors, especially of the head and the hindquarters, and drooling. Main necropsy findings included degenerative and necrotic changes of the larger medial muscle groups of the hindquarters, i.e., adductor, pectineus, quadriceps femoris, rectus femuris, sartorius, semimembranosus, semitendinosus, and vastus medialis, and of the forequarters, including pectoralis descendens, pectoralis ascendens, and transversus pectoralis. The main histologic findings consisted of degenerative and necrotic neuronal changes (chromatolysis) of varying severity and extent affecting selected nuclei of the brainstem and neurons of the ventral horns of the spinal cord. Similar microscopic lesions were observed in the neurons of the spinal cord of 1 experimental sheep force-fed for 35 days with 1 kg/day of the same batch of foodstuff that was originally fed to the cattle. Coarse white or gray lumps, interpreted as mycelia, were observed in the beer by-product. Aspergillus clavatus was the dominant fungus isolated. Deaths ceased after the consumption of beer residue was discontinued. Recovery from illness was observed in 1 animal. The diagnosis was based on epidemiological data, clinical signs, necropsy findings, histological lesions, dosing trial, and mycology. A similar condition caused by consumption of barley by-products, sprouted wheat, corn sprouts, and beetroot screenings contaminated with A. clavatus has been reported in cattle and sheep worldwide.

Neurological Disorder in Dairy Cattle Associated with Consumption of Beer Residues Contaminated with Aspergillus Clavatus