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Journal Article
Research Support, Non-U.S. Gov't
Hyperthermic syndrome in dairy cattle associated with consumption of ergots of Claviceps purpurea in southern Brazil.
Veterinary and Human Toxicology 2003 June
A hyperthermic syndrome (HS) associated with consumption of ration contaminated with Claviceps purpurea is described in 4 dairy cattle herds from different counties in the state of Rio Grande do Sul, southern Brazil. Outbreaks of this mycotoxicosis occurred during the summer of 1999-2000 and autumn of 2002 when 25% to 70% of cattle from those herds were affected. The disease occurred after the introduction of a new batch of feed contaminated with sclerotia of C. purpurea. First clinical signs were observed up to 3 mo after the ration was introduced and consisted of pyrexia, intense salivation and drooling, open-mouth, difficult breathing, in some cases with the tongue protruded, decrease in milk yield, decrease in food intake and weight loss. Affected cattle compulsively sought shade or water ponds. Signs were more pronounced during daytime. The severity of the clinical picture varied according to changes in environmental temperature during the day. There was complete recovery approximately 60 d after feeding with the contaminated ration was discontinued. Abortions occurred during the outbreak and soon after the remission of the clinical signs associated with HS. In one of the herds, reproductive performance and fertility were seriously impaired even after clinical signs of HS completely disappeared. Diagnosis was based on epidemiology, clinical signs and pathology. The pathogenetic mechanisms involved in the occurrence of HS are briefly discussed.
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