Efeito da fonte de carboidratos sobre o desempenho produtivo, saúde ruminal e sistêmica de vacas em pastejo
DOI:
https://doi.org/10.17533/udea.rccp.v33n4a01Palavras-chave:
acidose ruminal, amido, carboidratos não fibrosos, eficiência alimentar, fonte de energia, gado leiteiro, grãos de cereais, laminite, mandioca, polpa cítricaResumo
Antecedentes: as limitações nutricionais do Cenchrus clandestinus -alta concentração de proteína e baixa densidade de energia- faz necessário suplementar às vacas com fontes de carboidratos não-fibrosos (NFC) para melhorar o desempenho produtivo. No entanto, essa suplementação pode gerar acidose ruminal. Objetivo: avaliar a substituição parcial do milho (Zea mays, ZM) por sorgo (Sorghum vulgare, SV), mandioca (Manihot esculenta, MES) ou polpa cítrica (Citrus sp., C) na produção e qualidade do leite, pH ruminal e a saúde de vacas em pastejo. Métodos: oito vacas Holandesas foram avaliadas empregando um delineamento em quadrado latino 4 x 4 durante os primeiros 60 dias de lactação. Os tratamentos (rações isoenergéticas, 1,45 ± 0,003 Mcal NEL/kg DM) consistiram de uma mistura de forragem e quatro concentrados com diferentes fontes de NFC. Resultados: não foram observadas diferenças entre os tratamentos no consumo de matéria seca, eficiência alimentar, pH ruminal, perfil hematológico e metabólico. O pH ruminal foi superior a 6,0; confirmando a ausência de acidose ruminal. A produção do leite (corrigida para energia), proteína e sólidos totais foi maior para MES vs. C. Conclusões: nenhuma das fontes de NFC avaliadas comprometeu a saúde ruminal e sistêmica das vacas, embora o MES melhorou a produção e qualidade do leite.
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