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Antimicrobial susceptibility of ruminal strains of Butyrivibrio fibrisolvens


, : Antimicrobial susceptibility of ruminal strains of Butyrivibrio fibrisolvens. Acta Veterinaria Brno 63(3-4): 129-132

The susceptibility of five ruminal strains of Butyrivibrio fibrisolvens to 23 antimicrobial compounds was examined to evaluate effects of antimicrobials on this bacterium. All strains were very sensitive to ionophores and inhibitors of protein synthesis, except for aureomycin. On the contrary, butyrivibrios were relatively insensitive to inhibitors of carbohydrate metabolism and uncouplers. The strains studied displayed considerable variation in sensitivity to salinomycin, aureomycin and bacitracin. The substrate used to support the bacterial growth (glucose or xylose) influenced the susceptibility of isolates to antimicrobial agents. In one third of the measurements inhibitory concentrations of antimicrobial compounds were lower with xylose-grown than with glucose-grown cells. Different response of xylose-grown cultures to antimicrobials may reflect lower energy supply from fermentation of xylose which was metabolized more slowly and with lower biosynthetic efficiency.

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