Effect of Two Strains of Probiotics on the Antioxidant Capacity, Oxidative Stress, and Immune Responses of Salmonella-Challenged Broilers
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Fundação APINCO de Ciência e Tecnologia Avícolas
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The present study aimed at evaluating the effect of two strains of probiotics ( Bacillus subtilis PB6 and Bacillus Cereus var. toyoi ) on selected indicators of the antioxidant status and immune responses of broilers before and after challenge with Salmonella enterica subsp. Typhimurium ( S. typhimurium ). Birds were distributed into the following five treatments: negative control (CTL−); negative control+ S. typhimurium (CTL+); antibiotic+ S. typhimurium , (AB); Toyocerin®+ S. typhimurium (TOYO); and CloSTAT TM + S. typhimurium (CLOS). Birds in all treatments, except for CTL−, were orally challenged with 3 x10 9 CFU S. typhimurium at 16 days of age. The results showed that total antioxidant capacity (TAC), superoxide dismutase activity (SOD), and hydrogen peroxide (H 2 O 2 ) values were similar among all groups. The antibody titers against S. typhimurium and Newcastle disease (ND) were not affected by the treatments (p>0.05). However, S. typhimurium and ND titers were influenced by the interaction between week and treatment (p<0.01, p<0.05, respectively) and by week (p<0.001, p<0.001, respectively). In conclusion, S. typhimurium challenge had an impact on anti- Salmonella and NC titers. Both probiotics did not affect the broilers’ antioxidant capacity.
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