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Quatro bubalinos e quatro bovinos, fistulados no rúmen, foram distribuídos aleatoriamente a dois quadrados latinos (4 x 4) para avaliar os efeitos de rações com quatro níveis de FDN (54, 60, 66 e 72%) e de dois tamanhos de poros em sacos de náilon (53 e 100 mm) sobre a população de protozoários ciliados no conteúdo ruminal e dentro dos sacos incubados em diversos tempos. Não houve diferença nos diversos gêneros estudados e no total de protozoários nas amostras dos sacos de náilon entre 53 e 100 mm. As concentrações de Entodinium e de total de protozoários do conteúdo ruminal elevaram-se até o nível de 66% de FDN, com queda acentuada em 72% nos bubalinos, enquanto nos bovinos houve redução com o aumento de FDN na ração. Houve diferenças nas concentrações dos protozoários da subfamília Diplodiniinae, Epidinium e Dasytricha entre bubalinos e bovinos, dentro das amostras incubadas em sacos com poros de 53 mm. A concentração de Diplodiniinae aumentou com 72% de FDN na dieta em ambas as espécies animais. Os bubalinos apresentaram valores médios de pH e taxa de passagem do líquido ruminal mais elevados e volumes ruminais menores que os bovinos. Four buffaloes and four cattle, rumen fistulated, were utilized in two Latin Square (4 x 4) to evaluate the effects of rations with increasing levels of NDF (54, 60, 66 and 72% in DM) and two porous size of the nylon bags (53 and 100 mm) on the population of ciliate protozoa in rumen content and inside the nylon bags suspended in the rumen for several times. There was no difference in the several genus and in the total of protozoa in the samples of the nylon bags between 53 and 100 mm. The concentration of Entodinium and total of protozoa in the rumen content increased in the level of 66% of NDF with drop accentuated in 72% in the buffaloes, while in the cattle there was significant decrease with the increase of NDF in the ration. Rumen protozoa concentration of Diplodiniinae subfamily, Epidinium and Dasytricha were different for buffaloes and cattle inside the rumen incubated nylon bags with 53 mm pore size. Diplodiniinae concentration in the rumen content increased with 72% of NDF in diet in both animal species. The buffaloes presented higher pH average values and rate of passage and lower ruminal volumes than cattle

revista brasileira de zootecnia

Efeitos de Dietas com Diferentes Níveis de Fibra em Detergente Neutro e do Tamanho de Poros de Sacos de Náilon Incubados no Rúmen sobre a Fauna Ruminal em Bubalinos e Bovinos