Evaluation of Antimicrobial Activity of Four Organic Acids Used in Chicks Feed to ControlSalmonella typhimurium: Suggestion of Amendment in the Search Standard

Abstract

Today, the general public has become increasingly aware of salmonellosis problems. Organic acids are known by their antimicrobial potential and commonly used for improving the quality of poultry feed. In this context, the present work evaluated the inhibitory effect of four organic acids, namely, acetic acid, citric acid, lactic acid, and tartaric acid, at different levels of contamination bySalmonella typhimurium. The neutralization of these organic acidsin vitroand in the presence of one-day-old chick’s organs was also investigated during the search forSalmonellaserovars in birds as described in the Moroccan standard “NM 08.0.550.” The effect of four organic acids onSalmonella typhimuriumwas testedin vitroand in the presence of chick’s organs at different concentrations set of strain and organic acids tested. The MIC results demonstrated that tartaric acid, citric acid, and acetic acid inhibitedSalmonella typhimuriumat concentrations of 0.312%, 0.625%, and 0.512% for the three levels of strain: 10, 100, and 103 CFU/ml, respectively, while lactic acid and depending on the amount of the strain introduced acts differently: 0.078% for 10 CFU/ml and 0.156% for 100 and 103 CFU/ml. The concentration of 0.04M of Na2HPO4solution has proved,in vitro, in caecums and organs of chicks (in presence of organic acids) that strain introduced, even at low concentrations, can be recovered. The use of additives has beneficial effects inSalmonellacontrol program. However, the present results recommend the amendment ofSalmonellaresearch standard, taking into account the probable presence of organic acids in digestive content of one-day-old chicks.