Impacto dos métodos de processamento e suplementação de aminoácidos da farinha de raiz e folhas de mandioca no desempenho e na microflora dos cecos de frangos de corte
DOI:
https://doi.org/10.1590/1809-6891v26e-80893EResumo
Este estudo investigou os efeitos da farinha de raiz e das folhas de mandioca processada (FRFM) no desempenho de frangos de corte e na microflora cecal. Um total de 240 frangos de corte Ross foram distribuídos aleatoriamente por 10 tratamentos alimentares em um desenho fatorial 5×2, composto por cinco fontes de energia: milho, FRFM seco ao sol (FRFMSS), FRFM fermentado (FRFMf), FRFM com levedura (FRFMl) e FRFM com filtrado ruminal (FRFMfr) e dois níveis de aminoácidos (Ideal e National Research Council (NRC) 1994). As dietas NRC incluíam metionina e lisina, enquanto as dietas Ideais foram suplementadas com treonina e arginina. Cada tratamento foi replicado três vezes com oito aves por repetição, e o ensaio teve a duração de 28 dias. Os parâmetros de desempenho foram registados semanalmente e, no dia 28, as aves selecionadas foram abatidas para análise da microflora intestinal. Os resultados indicaram que as dietas formuladas com níveis ótimos de aminoácidos melhoraram significativamente (P<0,05) o ganho de peso (GP) e a taxa de conversão alimentar (TCA). As aves alimentadas com dietas à base de FRFMfr apresentaram uma ingestão de ração (IR) significativamente mais baixa (P<0,05) e uma melhor conversão alimentar, comparável às alimentadas com dietas à base de milho. Notavelmente, a combinação de aminoácidos FRFMfr e Ideal resultou no menor (P<0,05) IR e no melhor TCA global. A análise microbiana revelou que as dietas à base de milho resultaram em contagens mais elevadas (P<0,05) de Bacillus subtilis e Proteus mirabilis, enquanto a dieta à base de FRFM, independentemente do nível de aminoácidos, resultou em contagens bacterianas totais (CBTs) significativamente mais baixas (P<0,05). Concluindo, a suplementação de dietas para frangos de corte com aminoácidos ideais melhorou o desempenho do crescimento, e o FRFMfr reduziu de maneira eficaz a ingestão de ração sem comprometer a conversão alimentar. Além disso, o FRFM processado mostrou ser benéfico na redução da carga microbiana quando utilizado como alternativa ao milho em dietas de frangos de corte.
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