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Chez les animaux, l’administration d’antibiotiques augmenterait la prevalence de la resistance au sein des bacteries de la flore commensale. De ce fait, l’objectif de l’etude etait de determiner l’effet de l’administration de tetracycline et de colistine sur l’antibioresistance d’enterobacteries, particulierement, Escherichia coli du microbiote de porcelets. Un elevage de trois lots de deux porcelets a ete realise, auxquels ont ete administres par voie orale, la colistine ou la tetracycline. Un denombrement d’enterobacteries resistantes a ete realise sur milieu Mac Conkey additionne d’antibiotique et un antibiogramme par la methode de diffusion des disques en milieu gelose de Muller-Hinton a ete effectue sur les souches de Escherichia coli identifiees a partir des selles. Chez les porcelets traites, le niveau d’antibioresistance des enterobacteries a ete respectivement de 30,9% pour la colistine et de 63,1% pour la tetracycline. L’etude a revele 80% de Escherichia coli resistant a la tetracycline et le taux de resistance a augmente de 56,3%. Les souches de Escherichia coli isolees de porcelets traites a la tetracycline, ont presente une resistance croisee a l’amoxicilline (76,9%) et a la ceftazidime (83,3%). Les resultats de l’etude confirment l’augmentation de resistance par pression d’administration d’antibiotique ; ce qui necessite des mesures alternatives d’utilisation des antibiotiques en elevage.  Mots cles : porcelets, Escherichia coli, antibioresistance, colistine, tetracycline English Title: Effect of tetracycline and colistin administration on antimicrobial resistance of Escherichia coli in post-weaned piglet’s microbiota In animals, the administration of antibiotics would increase the prevalence of resistance in commensal flora bacteria. This study aimed at determining the effect of tetracycline and colistin administration on enterobacteria resistant prevalence especially, Escherichia coli from piglets microbiota. A breeding of three batches of two piglets was carried out, to which were administered orally colistin and tetracycline. Enterobacteria resistant enumeration was performed on Mac Conkey medium supplemented with antibiotic and an antibiotic susceptibility test using Muller-Hinton agar medium disc diffusion method was carried out on Escherichia coli strains identified from stool. In treated piglets, the level of antibiotic resistance of enterobacteria was 30.9% for colistin and 63.1% for tetracycline. This study revealed 80% of Escherichia coli tetracycline-resistant and the resistance rate increased by 56.3%. Escherichia coli strains isolated from tetracycline treated piglets showed cross resistance to amoxicillin (76.9%) and ceftazidime (83.3%). This study results confirm resistance increase by antibiotic administration pressure; that requires alternative measures for antibiotics use in livestock farming. Keywords : piglets, Escherichia coli , antibiotic resistance, colistin, tetracycline.

international journal of biological and chemical sciences

Effet de l’administration de la tétracycline et de la colistine sur l’antibiorésistance de &lt;i&gt;Escherichia coli&lt;/i&gt; du microbiote chez des porcelets post-sevrés