Estresse oxidativo em bovinos confinados alimentados com feno de Brachiaria e suplementados com antioxidantes

• Ano de defesa: 2014
• Autor(a) principal: Cunha, Roberta Dias da Silva
• Orientador(a): Fioravanti, Maria Clorinda Soares
• Banca de defesa: Fioravanti, Maria Clorinda Soares, Oliveira Filho, José Paes de, Lima, Flávia Gontijo de, Moura, Maria Ivete
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Ciência Animal (EVZ)
• Departamento: Escola de Veterinária e Zootecnia - EVZ (RG)
• País: Brasil
• Palavras-chave em Português: Enzimas antioxidantes; Lipoperoxidação; Ruminantes e suplementação
• Palavras-chave em Inglês: Antioxidant enzymes; Lipid peroxidation; Ruminants and supplementation
• Área do conhecimento CNPq: CLINICA E CIRURGIA ANIMAL::CLINICA CIRURGICA ANIMAL
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/5848

Oxidative stress is related to the development of different pathological processes. Interventions that reduce the generation or the effects of free radicals have shown controversial results in animal models. In this study, we evaluated the effects of supplementation with different antioxidants through assessment of oxidative stress biomarkers in erythrocytes (thiobarbituric acid reactive substances, superoxide dismutase, glutathione full, glutathione peroxidase and catalase) in hepatocytes (malondialdehyde), clinical laboratory tests and histological exam. 40 Nelore bovines were sorted into five groups, as follows: one control without supplementation, three groups individually supplemented with vitamin E, selenium and zinc and one group supplemented with the combination of selenium and vitamin E. For 105 days, all animals were fed roughage (brachiaria hay) and concentrate (feed) in a 70:30 ratio. The Biomarkers of oxidative stress evaluation in erythrocytes did not indicate the presence of lipid peroxidation. In the liver, supplementation with antioxidant selenium and vitamin E reduced the number of foamy macrophages in the parenchyma, as well as tissue lipid peroxidation. The animals did not develop clinical liver abnormalities throughout the experimental period, since aspartate aminotransferase and gamma glutamyltransferase serum activity remained within normal range. There was positive correlation between the concentration of the biomarker malondialdehyde and foamy macrophages. In conclusion, feedlot cattle ingesting Brachiaria sp present lipid peroxidation in hepatocytes and the combination of the antioxidants selenium and vitamin E reduces the effects of oxidative stress.