Detoxificação de nitrato usando antioxidantes e probióticos na água para coelhos
DOI:
https://doi.org/10.17533/udea.rccp.v31n2a06Palavras-chave:
aditivos, nutrição animal, composição e qualidade da agua, poluição da agua, purificação da águaResumo
Antecedentes: As práticas agrícolas aumentam a contaminação de águas subterrâneas a partir de nitrato e a alta ingestão desta substância pode afetar negativamente o crescimento animal. Objetivo: Determinar os efeitos de diferentes níveis de nitrato na água de bebida sobre as funções digestivas, hepáticas e renais, ingestão de água e ração e determinar a habilidade da vitamina C, vitamina E + Selênio (Se) ou probiótico em sobrepor os efeitos do nitrato em coelhos Nova Zelândia Branco. Métodos: Quarenta e dois coelhos machos foram distribuídos ao acaso em seis tratamentos: 1) grupo controle (sem nitrato), 2) 350 ppm de nitrato, 3) 700 ppm de nitrato, 4) 700 ppm + 200 ppm de vitamina C, 5) 700 ppm + 200 ppm vitamina E + Se e 6) 700 ppm + 1000 ppm de probiótico. Foram avaliados o desempenho produtivo, as funções digestivas, hepáticas e renais além da histologia hepática e renal. Resultados: A ingestão de 350 ppm de nitrato diminuiu (p<0,05) a ingestão de água. Coelhos que receberam 700 ppm de nitrato apresentaram menor (p<0,05) ingestão de matéria seca, menor digestibilidade de nutrientes, e maior (p<0,05) ingestão de água e de nitrato, maior concentração plasmática de ureia e maiores atividades de aspartato aminotransferase (AST) e alanina aminotransferase (ALT). A adição de vitaminas C ou vitamina E + Se e probiótico melhorou (p<0,05) o consumo de ração, a digestibilidade de nutrientes e reduziram (p<0,05) a ingestão de água e de nitrato, a concentração de ureia e as atividades de AST e ALT. Conclusão: Coelhos podem tolerar até 350 ppm de nitrato, mas 700 ppm de nitrato afeta negativamente as funções digestivas, hepáticas e renais, as quais são melhoradas a partir da suplementação de vitamina C, vitamina E + Se ou ainda probiótico.
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