Resumen:
The pivotal aim of the present context was to isolate diversified group of bacteria from the ruminants and to
evaluate their antibiogram pattern against 22 antibiotics of 14 different classes. The bacterial isolates from small
and large ruminant (sheep, cattle and calves) were isolated from the rumen based on various colonies morphology,
and subjected for preliminary antibiotics susceptibility assay using disc diffusion method. The most
sensitive isolates (based on zone of inhibition) were selected for determining the minimum inhibitory concentration
(MIC) of each antibiotic ranging from 1 to 256 μg/mL. Results revealed the concentration dependent
growth inhibitory property of antibiotics a species-specific process. The maximum tolerable concentration (MTC)
of each antibiotic was further determined using disc diffusion method, and results exhibited that the tolerance
nature of ruminal isolates to antibiotics is a species-specific mechanism. Based on the MIC and MTC values of
antibiotics, amikacin, ciprofloxacin, and amoxicilline were observed to be the most potent antibiotics in terms of
inhibiting the growth of ruminal isolates. In brief, the findings of the current study showed that despite the
overexploitation of antibiotics as additives in the animal's feed, most of the ruminal isolates are sensitive to
multiple conventional antibiotics tested. The growth inhibitory trait of antibiotics proves these antimicrobials a
propitious agent against the pathogenesis of ruminal isolates in livestock