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    Etiology of some diseases in calves raised under extensive conditions in the Paranaiba region of Mato Grosso do Sul, Brazil

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    Foram estudadas algumas doenças de bezerros de corte nelorados, criados extensivamente. Os animais dos grupos A, B e C, alimentados com diferentes misturas minerais, foram vistoriados diariamente, e os bezerros doentes foram submetidos a um exame clínico, sendo colhido sangue e fezes para exames. A diarréia foi o sinal clínico mais observado, e a Escherichia coli, o agente isolado com maior freqüência. Salmonella newport, S. give, Proteus sp. e Enterobacter sp. também foram identificados. A presença de Strongyloides papillosus foi detectada principalmente em animais até 150 dias de idade. Dezessete amostras de Eimeria spp. foram observadas. Em 8,0% dos animais dos grupos A e B e 3,8% do C apresentaram infecção patente por Babesia spp., e 18,0, 12,0 e 13,5% dos animais dos grupos A, B e C, respectivamente, apresentaram infecção patente por Anaplasma margínale. Exames feitos na cavidade oral constataram "cara inchada" em bezerros dos três grupos. Não houve diferença significativa (P > 0,05) entre os grupos, mesmo quando comparados os bezerros sadios e os doentes.Some diseases were studied in Nellore beef calves raised under extensive conditions. Animals in groups A, B and C, who received supplementation with different mineral mixtures, were observed daily and sick animals were examined clinically; blood and faecal samples were taken for analysis. Diarrhea was the main clinical sign and Escherichia coli was the agent most frequently isolated. Salmonella newport; S. give, Proteus sp. and Enterobacter sp. were also identified. Strongyloides papillosus was found principally in animais up to 150 days old. Efmeria spp. were found in 17 samples. In groups A and B, 8,0% of the animals showed patent infections of Babesia spp., in group C, 3,8% were positive. The animals of groups A, B and C showed 18.0, 12.0 and 13.5% patent infections of Anaplasma margínale, respectively. Examinations of the mouth showed the presence of "swollen jaw" ("cara inchada") in calves of the three groups. No significant difference (P > 0.05) was found between the three groups, even when healthy and sick animals were compared
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