Inhibitory effect of lactic acid bacteria against poultry intestinal pathogens

GUSILS CARLOS; ROSS ROMINA; GONZÁLEZ SILVIA

BIOCELL

Instituto de Histología y Embriología "Dr. Mario H. Burgos". CONICET

Lugar: Mendoza; Año: 2006 vol. 30 p. 190 - 190

0327-9545

The objective proposed for the development of this work was to study the interaction of probiotic BAL poultry with intestinal pathogens. The isolation of indigenous intestinal pathogenic was carried out employing selective and differential media. For the study of the capacity of inhibition were employed two technical in vitro: i) diffusion in agar; ii) mixed cultures (the interaction was followed by measuring optical density and CFU/ml). A high percentage of enteric bacteria were isolated form gastrointestinal tract of chicken (E coli, Salmonella, Shigella). Poultry BAL showed inhibition effect against a few enteric strains, Salmonella, E. coli, Shigella; and this antibacterial activity was due to the effect of acid substances.  Mixed culture studies indicated that selected BAL was able to inhibit the development of some intestinal pathogens (Shigella sp) as thus also an antibacterial effect on other intestinal pathogens (E. coli, Salmonella). We can conclude that the poultry BAL presented beneficial effects al to inhibit and/or to kill poultry indigenous pathogens, and this effect due mainly to the effect of acid substances.