Efeito de um aditivo fúngico multiespécie no perfil de fermentação ruminal, de-gradabilidade e cinética de produção de gases
DOI:
https://doi.org/10.31285/AGRO.28.1214Palavras-chave:
aditivo multifúngico, cinética in situ, fermentabilidade in vitroResumo
Dois experimentos avaliaramo efeito de um complexo fúngico multiespécie (BP, BIOPREMIX MX®, Ruminal Fermentation Tech, Uruguai). No Experimento 1 (E1) avaliou o efeito da adição de BP a uma ração mista total (TMR) no perfil de fermentação ruminal e na cinética de degradação in situ da TMR. No Experimento 2 (E2) avaliou o efeito da adição de BP a diferentes substratos na fermentabilidade in vitro. No E1, 4 vacas Holstein com cânulas ruminais foram aleatoriamente designadas para Controle (TMR com relação volumoso:concentrado 75:25) ou Controle + 120 g/vaca/d de BP (BP) e receberam TMR ad libitum por 30 dias. As mostras de TMR foram incubadas no rúmen para estimar a cinética de degradação in situ. O pH e concentrações de amônia e ácidos graxos voláteis (VFA) foram medidas no líquido ruminal imediatamente antes da alimentação, 4 horas e 8 horas após a alimentação. Em E2, um arranjo fatorial de níveis de BP (6,5 g BP/ kg MS incubado –WBP ou sem BP -Control) e 8 substratos. Foram estimadas a cinética de produção de gases in vitro (GPk), a digestibilidade da matéria seca (IVDMD), o potencial metanogênico (CH4), o fator de partição (FP), os AGV e a proteína microbiana (MCP). O BP aumentou a proporção de propionato (P ≤ 0,05) e reduziu a relação cetogênico:glicogênico e a fase Lag da FDN (P ≤ 0,05). O WBP tendeuaaumentara IVDMD e o substrato afetou, IVDMD, CH4, PF, VFA total e MCP (P ≤ 0,01). No geral, BP melhorou o metabolismo ruminal favorecendo um perfil mais glicogênico, um encurtamento da fase Lag na degradação da FDN e um aumento na IVDMD.
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