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摘要
Avaliou-se a digestibilidade in vitro da mat谷ria seca (DIVMS) de ra es com cinco teores de concentrado (0, 5, 10, 20 e 50%) e aus那ncia ou presen a de aditivos (ra estestemunha, com ion車foro (Rumensin ) e com probi車tico (Beef-sacc )), consistindo umfatorial de 5 x 3. Tamb谷m, foi avaliada a DIVMS de ra es com 50:50%volumoso:concentrado, sem e com a adi o de ion車foro, probi車tico e antibi車tico promotor de crescimento (BMD ) e sua combina o, perfazendo oito ra es com quatro repetic es, em delineamento inteiramente casualizado. Em todas as ra es avaliadas, foi utilizadoliqu赤do ruminal de um bovino e de um bubalino. Para as duas esp谷cies, houve intera o (p %26lt; 0,01) para os teores crescentes de concentrado e aditivos. Para os bubalinos, a ra o com ion車foro apresentou valor m芍ximo para a DIVMS (64,8%) para 41,9% de concentrado, emrela o 角s ra es-testemunha e com probi車tico, que apresentaram comportamento semelhante. Para os bovinos, verificou-se superioridade do probi車tico em rela o ao ion車foro em ra es com at谷 50% de concentrado. Entretanto, para o efeito isolado e combinat車rio entre aditivos em ra es com 50:50% volumoso:concentrado, sobre aDIVMS, os resultados permitem concluir que as combina es foram semelhantes ou inferiores aos efeitos isolados dos aditivos, em ambas as esp谷cies. This study evaluated the dry matter in vitro digestibility(DMIVD) of rations with 5 concentrate levels (0, 5, 10, 20 and 50%), and the absence or presence of additives (control, ionophore (Rumensin ) or probiotic (Beef-sacc )), consisting of a 5 x 3 factorial. It also evaluated the DMIVD of rations with 50:50%roughage:concentrate with or without addition of ionophore, probiotic, growth-promoting antibiotic (BMD ) and the combination of them, consisting of 8 treatments and 4 repetitions, using a randomized design. For all evaluated rations, ruminal liquid from abovine and a buffalo was used. For both species, there was an interaction (p %26lt; 0.01) for increasing levels of concentrate and additives. For buffaloes, the ration with ionophore showed maximum DMIVD value (64.8%) for 41.9% of concentrate; control and probioticrations presented similar values between them. For bovines, a superiority of probiotic over ionophore was observed in rations with up to 50% of concentrate. However, in isolated and combined effects among additives in rations with 50:50% roughage:concentrate onDMIVD, the results showed that the combinations are similar or inferior to the isolated effects of additives in both species.
