Intoxicação aguda espontânea e experimental por samambaia (Pteridium aquilinum) em bovinos

• Ano de defesa: 2009
• Autor(a) principal: Anjos, Bruno Leite dos
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Santa Maria; BR; Medicina Veterinária; UFSM; Programa de Pós-Graduação em Medicina Veterinária
• Palavras-chave em Português: Doenças de bovinos; Plantas tóxicas; Samambaia; Pteridium aquilinum; Distúrbios da hemostasia; Aplasia de medula óssea; Patologia; Diseases of cattle; Poisonous plants; Bracken fern; Disturbances of hemostasis; Bone marrow aplasia; Pathology; CNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIA
• Link de acesso: http://repositorio.ufsm.br/handle/1/10032

The epidemiology, pathogenesis, clinical and pathological aspects of the spontaneous and experimental poisoning of cattle by bracken fern (Pteridium aquilinum) were studied. Two scientific papers that stemmed from these studies are presented and discussed here. Initially, 6,256 necropsy reports from cattle necropsied during a de 43-year-period (1964-2006) were reviewed. Of those, 15 cases were consistent with acute poisoning caused by the ingestion of P. aquilinum and they occurred in cattle from small farms in the Central region of the State of Rio Grande do Sul, Brazil. In 40% of the farms the disease occurred in small outbreaks affecting several cattle per farm and in 60% only one bovine was affected in each farm. Morbidity and mortality were 17.9% and lethality was virtually 100%. The poisoning was experimentally produced in four calves; it was concluded that exclusively the events of the primary hemostasis due to thrombocytopenia are responsible for the hemorrhages. Blood culture from three affected calves yield the growth of Klebsiella oxytoca, Staphylococcus hyicus and S. aureus, indicating that septicemia, facilitated by neutropenia could have a role in the death of cattle acutely poisoned due to the ingestion of P. aquilinum.