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The objective of this study was to identify Enterobacteriaceae of the broiler intestinal microbiota submitted to four different treatments  involving nitrofurans, from the 15th to the 23th day of life. Fecal samples, from the chickens’ sewers, were collected through sterilized  swabs from 52 chickens of the Cobb strain, afterwards taken into Cary-blair method to isolation, and identification of genus and  species through the conventional bacteriological tests and Bactray I/II systems. The genera and species isolated in nitrofurans  treatments and in the control were: Citrobacter spp., Escherichia coli, Escherichia fergusonii, Escherichia Hermannii, Enterobacter  aerogenes, Enterobacter aminigenus, Enterobacter cloacae, Enterobacter sakazakii, Hafnia alvei, Klebsiella oxytoca, Klebsiella  ozaenae, Klebsiella pneumoniae, Morganella morganii, Proteus spp e Pseudomonas luteola. Of all treatments, the highest percentage  of isolated Escherichia coli occurred in the control group, being the latter the one which presented the lowest microorganism diversity  – only two genera were identified. The use of antibiotics in the feed on other treatments can be an explanation the imbalance of  the common tract microbiota, resulting in a population growth of other Enterobacteriaceae.

Identificação de Enterobacteriaceae da microbiota intestinal de frangos de corte submetidos a dieta com nitrofuranos