Effect of using sybiotic Lactobacillus plantarum probiotic and xylooligosaccharides prebiotic on growth indices in rainbow trout (Oncorhynchus mykiss)

In this study we investigated the synbiotic effect of Lactobacillus plantarum and Xylooligosaccharide prebiotic on growth factors of rainbow trout Oncorhynchus mykiss. 480 fish (average weight 77±3 g) were randomly distributed into 8 treatments with three replicates for each treatment. First group fed control diet, groups 2, 3 and 4 fed control diet containing 0.5, 1 and 2 percent Xylooligosaccharides prebiotic, groups 5, 6 and 7 fed same amounts of prebiotic plus 108 CFU Lactobacillus plantarum per gram feed for a period of 2 months. No significant differences were observed on growth parameters between the treatments at the end of the experiment (P > 0.05). However, inclusion of 0.5 percent Xylooligosaccharides plus probiotic in feed showed slightly positive effect on growth indices, and in general use of prebiotic and probiotic had no negative effect on growth.