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Antibiotic resistance is a global health problem. In particular, chickens are the source of antibiotic resistance and resistance genes. In this study, it was aimed to investigate the Gram-negative bacterial species that cannot ferment lactose from cloacal swap samples and to determine the antibiotic resistance profiles. Identification of the bacteria was performed with MALDI-TOF-MS and multidrug resistance was determined by disk diffusion test. In addition, the presence of ESBL, AmpC and carbapenemase in isolates was investigated by CLSI directions. Totally, 27 isolates were collected and 20 of them were Escherichia coli, 4 of them were E. fergusonii and 1 isolate of Pseudomonas fulva, Aeromonas media, Serratia marcescens. 19 different antibiotic discs from 7 different classes were used in the study and 63% of bacteria had resistance to antibiotics from 3 or more classes. While the highest resistance rate was observed in tetracycline (74.07%), all isolates were found that sensitive to imipenem. While carbapenemase could not be detected in any isolate, it was observed that P. fulva had ESBL and AmpC. Also, PCR was conducted for blaCTX-M, CIT, blaKPC genes in P. fulva. It was found that the bacterium had only blaCTX-M gene. As a result, although it is pleasing to find low presence of beta lactamase, high multidrug resistance has been determined in bacteria. This situation suggests newer therapeutic approaches. In addition, considering the "One Health" concept, antibiotic resistance should be constantly monitored with the interaction of the animal-human-environment. Because the development of resistance is in a constant state of change between bacteria. [ABSTRACT FROM AUTHOR]