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Avaliaram-se o consumo, as digestibilidades total, ruminal e intestinal dos nutrientes, a taxa de passagem da digesta ruminal e as concentrações de amônia e pH ruminal de dietas contendo silagens de milho e sorgo, com e sem inoculante microbiano. Utilizaram-se quatro animais Holandês x Zebu fistulados no rúmen e no abomaso, distribuídos em um quadrado latino 4 x 4 (duas silagens x dois inoculantes). Adotou-se uma relação volumoso:concentrado de 63:37%, na MS. O consumo e as digestibilidades total e ruminal dos nutrientes não foram influenciados pelas dietas experimentais. Para os consumos de MS, PB e NDT, registraram-se, respectivamente, valores médios de 6,61; 0,75 e 3,96 kg/dia. Obtiveram-se valores médios de 61,17 e 61,91; 61,43 e 13,21 e 52,13 e 92,96% para as digestibilidades total e ruminal da MS, PB e FDN, respectivamente. Quanto à digestibilidade intestinal dos nutrientes, detectou-se efeito do tipo de silagem apenas na FDN, observando-se maior valor para a dieta à base de silagem de milho (9,08) em relação à de sorgo (4,77%). Não houve efeito de dietas, nem do tempo de coleta, sobre os valores de pH ruminal, que apresentou valor médio de 5,58. Todavia, houve efeito do tempo de coleta sobre a concentração de amônia ruminal (N-NH3), estimando-se valores máximos de 10,82; 9,04; 9,47 e 8,84 mg/100 mL nas dietas com as silagens de milho não tratada e tratada com inoculante microbiano e com as silagens de sorgo não tratada e tratada com inoculante microbiano, respectivamente. As taxas de passagem médias estimadas nas dietas com silagens de milho sem e com inoculante microbiano e com silagens de sorgo sem e com inoculante microbiano, foram de 5,05; 4,29; 5,12 e 4,44%/h, respectivamente. Four crossbred Holstein x Zebu steers fitted with ruminal and abomasal cannulas were randomly assigned to a 4 x 4 Latin square to evaluate the effects of feeding corn or sorghum silages with and without microbial inoculant on intake, ruminal metabolism, total and partial digestibility of nutrients, and digesta passage rate. Diets contained, dry matter (DM) basis, a forage to concentrate ratio of 63:37. No significant differences were observed on the intakes of DM, crude protein (CP), and total digestible nutrients, which averaged 6.61, 0.75 and 3.96 kg/day across diets, respectively. Total and ruminal apparent digestibilities of DM, CP and neutral detergente fiber (NDF) also were not affected by diets averaging 61.17 and 61.91, 61.43 and 13.21, and 52.13 and 92.96%, respectively. However, a dietary effect was observed for the intestinal digestibility of NDF; steers fed corn silage had greater intestinal digestibility of NDF (9.08%) than those fed sorghum silage (4.77%). Ruminal pH was not affected by diet and time of collection, with an overall mean of 5.58. Conversely, concentration of ruminal ammonia was affected by time of collection with estimated maximum values of 9.04, 10.82, 8.84, and 9.47 mg/100 mL for diets containing corn and sorghum silages with and without microbial inoculant, respectively. Estimated digesta passage rates of diets containing corn and sorghum silages with and without microbial inoculant were of 4.29, 5.05, 4.44, and 5.12 %/h, respectively

Consumo e digestibilidades dos nutrientes em bovinos recebendo dietas contendo silagens de milho e sorgo, com e sem inoculante microbiano