Valores sangüíneos de chumbo em bovinos nelore suplementados com sal mineral naturalmente contaminado por chumbo
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Data
1998-03-01
Autores
Marçal, Wilmar Sachetin
Campos Neto, Otávio [UNESP]
Nascimento, Marcos Roberto do
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal de Santa Maria (UFSM)
Resumo
A pesquisa foi realizada em 8 propriedades rurais com regime de criação extensiva, situadas às margens da represa de Barra Bonita, no município de Anhembi, estado de São Paulo. Amostras de sal mineral, capim e sangue animal foram colhidas para análise laboratorial, para se investigar a presença de chumbo. Foram utilizados 160 bovinos, machos e fêmeas, da raça Nelore, divididos em dois grupos de 80 animais. A finalidade precípua foi realizar um estudo comparativo entre os dois grupos, sendo que no primeiro os animais recebiam sal mineral sabidamente contaminado com chumbo. O segundo grupo serviu como lote para efeito comparativo. O critério de comparação foi a análise sangüínea que revelou valores aquém do limite de tolerância biológico atribuído à espécie bovina, em ambos os grupos. Os resultados permitem a conclusão de que, aos níveis de chumbo detectados nas amostras mineralizadas, ainda não há risco de efeito cumulativo e tóxico para os bovinos avaliados.
This study was performed at the beef cattle region at Anhembi County, State of São Paulo, Brazil. Eight beef farms where cattle were raised at pasture were selected. These farms were located around Barra Bonita dam. One-hundred-and-sixty Nelore cattle, males and females, were divided into two groups of 80 cattle each. One group received mineral salt naturally contaminated with lead, whereas the other group received lead-free mineral salt. The main goal of this study was to compare both groups. Blood samples, and samples from the mineral salt and grass were collected and analyzed for the presence of lead. Blood lead concentration was found to be below the tolerance limit for this species in both groups. It was concluded that the lead concentration detected in the mineral salt did not present a risk for toxicity and cumulative effects in the population studied.
This study was performed at the beef cattle region at Anhembi County, State of São Paulo, Brazil. Eight beef farms where cattle were raised at pasture were selected. These farms were located around Barra Bonita dam. One-hundred-and-sixty Nelore cattle, males and females, were divided into two groups of 80 cattle each. One group received mineral salt naturally contaminated with lead, whereas the other group received lead-free mineral salt. The main goal of this study was to compare both groups. Blood samples, and samples from the mineral salt and grass were collected and analyzed for the presence of lead. Blood lead concentration was found to be below the tolerance limit for this species in both groups. It was concluded that the lead concentration detected in the mineral salt did not present a risk for toxicity and cumulative effects in the population studied.
Descrição
Palavras-chave
sangue, bovinos, sal mineral, chumbo, blood, cattle, mineral salt, lead
Como citar
Ciência Rural. Universidade Federal de Santa Maria (UFSM), v. 28, n. 1, p. 53-57, 1998.