evaluation of the probiotic potential of isolated from native swine manure.

BACKGROUND AND AIM

Using antimicrobials as a feed additive in swine production is prohibited because it is a major cause of the emergence of antimicrobial-resistant bacteria. Probiotics such as spp. are an attractive alternative to reduce antimicrobial resistance and promote swine growth. This study aimed to evaluate the probiotic properties of isolated from indigenous swine manure.

MATERIALS AND METHODS

A total of 30 fecal samples from healthy individual indigenous pigs were collected and isolated on de Man, Rogosa, and Sharpe agar. The preliminary screen identified candidates with antibacterial activity against six pathogens and >50% survival and tolerance to acid (pH 3.0) and 1% bile salt. Isolates that passed the initial screen will be tested for other probiotic properties.

RESULTS

Of the 314 isolates from 30 pig manure samples, 17 isolates satisfied all initial conditions for probiotic properties. Each isolate has unique, distinctive properties. Isolates B4, B5, B8, B17, B87, and B144 formed thick biofilms, whereas isolates B5, B8, and 27 adhered well to the intestinal wall and exhibited strong autoaggregation properties. Isolate B4 aggregated with Enterohemorrhagic and Enteropathogenic . Tests in pH-adjusted cell-free medium indicated that the antibacterial activity resulted from bacterial acidification rather than bacteriocin formation. Sequence analysis () revealed 16 of the isolates were , and only one isolate was .

CONCLUSION

We isolated 17 from swine manure and demonstrated that their probiotic properties might be useful as a probiotic cocktail for swine feed.