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Abstract
The purpose of this study was to isolate potentially probiotic Lactobacillus strains from chicken manure and evaluate their biological properties. The experiment was implemented at the laboratory of the Department of Animal sciences and Veterinary medicine, University of Agriculture and Forestry, Hue University. After isolation, Lactobacillus strains were tested for antibiotic resistance, extracellular enzyme production and resistance to intestinal bacteria. The study results indicated that all of 28 isolated strains had typical characteristics of Lactobacillus bacteria. Regarding the biological characteristics of bacteria, the results showed that 100% of bacterial strains were resistant to 2/5 tested antibiotics, all 28 strains were capable of producing extracellular protease and amylase. Furthermore, 24/28 strains were resistant to intestinal bacteria. Among them, strains LB14, LB21, LB27 had the strongest resistance to Salmonella (22mm) and strain LB17 had the strongest resistance to E. coli (15mm). The results of this study are the basis for further research on optimal conditions for the growth of Lactobacillus bacteria with a view to develop the probiotic products using in animal farming.