Veterinary Research Forum
Vet Res Forum

Evaluation of lactic acid bacteria isolated from poultry feces as potential probiotic and its in vitro competitive activity against Salmonella typhimurium

Document Type : Original Article

Authors

Mandana Salehizadeh 1
Mohammad Hossein Modarressi 1
Seyed Naser Mousavi 2
Maryam Tajabadi Ebrahimi 3

1 Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Department of Animal Science, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran

3 Department of Biology, Faculty of Sciences, Central Tehran Branch, Islamic Azad University, Tehran, Iran

https://doi.org/10.30466/vrf.2018.84395.2110
Abstract
The efficacy of probiotics as alternatives to antibiotics has been defined as one of the potential strategies to prevent Salmonella spp. infection in poultry. The purpose of this study was to isolate probiotic native Lactic acid bacteria (LAB) with high compatibility to intestinal tract and prevention of Salmonella typhimuriumfrom broiler chicken feces. Thirty-seven samples of chicken feces were collected from seven broiler chicken farms in Northern Iran. The isolates identification was carried out with morphological and biochemical tests. Agar diffusion methods were used to evaluate the antimicrobial activities against Escherichia coli and S. typhimurium. The primary probiotic characteristics such as resistance to acid and bile and adhesion to Caco-2 cells were studied. Indeed, the ability of LAB isolates to inhibit adhesion of S. typhimurium to Caco-2 cells was evaluated by exclusion, competition and displacement assays. Among 42 isolates, S08, S01 and S06 isolates which showed appropriate probiotics characteristics were selected. Isolates S08 and S01 showed to be able to adhere strongly and also S06 was adhered moderately. In the exclusion assay, the isolates S08, S01 and S06 significantly hampered adhesion of S. typhimurium cell, in the competition assay, the isolates S08, S01 showed significant level of competition activity against S. typhimurium adherence to Caco-2 cells and isolate S08 showed the greatest displacement activity. The 16S rDNA sequence revealed that S08, S01, and S06 isolates were 99.00% similar to Lactobacillus salivarius, Lactobacillus johnsonii, and Pediococcus acidilactici, respectively. The result of this study suggested that LAB isolated from broiler chicken feces could be a remarkable reservoir for identification of probiotic to inhibit the pathogenic bacteria growth.

Keywords

Antimicrobial activity
Broiler chicken
Probiotic

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Veterinary Research Forum
Volume 11, Issue 1
Winter 2020
Pages 67-75

  • Receive Date 17 April 2018
  • Revise Date 19 August 2018
  • Accept Date 25 September 2018

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