Effect of viable Bacillus coagulans as a dietary probiotic on the growth performance, survivorship, immune response, and meat quality of the common carp, Cyprinus carpio, was investigated. Three treatments (T-1, T-2, and T-3) and a control, each with three replicates, were established. T-1, T-2, and T-3 groups were fed with diets containing different levels of probiotic (1 × 107 cfu/g, 2 × 107 cfu/g, and 4 × 107 cfu/g, respectively). After 45 d, the fish fed with probiotic had significantly higher (P < 0.05) daily weight gain compared to that of the control group. Significant increases (P < 0.05) in final weight, relative weight gain rate, lysozyme, myeloperoxidase, and respiratory burst activities were obtained in the T-2 and T-3 compared with those of the control. Fish in the control group showed the lowest (P < 0.05) content of complement component 3. Significantly (P < 0.05) improved contents of crude fat, inosine, and inosinic acid were observed in the T-2 and T-3. Our results indicated that the use of B. coagulans as a dietary probiotic for the common carp could improve growth performance, meat quality, and induce a positive modulation on immune response.
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