Comparing the Effects of Supplementary Antibiotic, Probiotic, and Prebiotic on Carcass Composition, Salmonella Counts and Serotypes in Droppings and Intestine of Broiler Chickens

The effects of antibiotic, probiotic, and prebiotic as dietary feed additives on carcass composition as well as Salmonella counts and its serotypes in droppings and intestine of broiler chickens on days 1, 28, and 56 of experiment were investigated. Dietary treatments were control diet (basal diet without additives), OXYT diet (basal diet with 600 ppm of the antibiotic oxytetracycline), GRO-UP diet (basal diet with 500 ppm probiotic), and MOS-500 or MOS-1000 diets (basal diet with 500 or 1000 ppm mannan oligosaccharide prebiotic, respectively). From an initial total of 190 day-old Arbor acres broiler chicks, two birds were randomly selected from each treatment and sampled for Salmonella. The remaining 180 birds were randomly allotted to the five dietary treatments with three replicates of 12 birds each. Feed and water were supplied ad libitum. The results indicated that breast, neck, drumsticks and liver yields significantly affected by the inclusion of feed additives (P < 0.05). Significant differences were observed in average Salmonella counts in both the intestines and droppings of broiler chickens at different days of experiment (P < 0.05). Salmonella Gallinarum and Salmonella Typhi were serotypes identified in the droppings and intestine of broiler chickens. Our findings reveal that the inclusion of prebiotic oligomanno or probiotic GRO-UP as antibiotic substitutes in diets of broiler chickens can rapidly reduce some Salmonella serotypes and aid to the control Salmonella organisms.