Effects of low levels of mannanoligosaccharides in feed on growth and intestinal salmonella reduction in juvenile rainbow trout (Ocorhynchus mykiss)

• Main Authors: Pavličević Jerko M., Bogut Ivan A., Glamuzina Branko A., Savić Nebojša M.
• Format: Article
• Language: English
• Published: University of Belgrade - Faculty of Agriculture, Belgrade 2015-01-01
• Series: Journal of Agricultural Sciences (Belgrade)
• Subjects: mannanoligosaccharides; rainbow trout; growth performance
• Online Access: http://www.doiserbia.nb.rs/img/doi/1450-8109/2015/1450-81091503339P.pdf

Low levels of added mannanoligosaccharides (MOS) in the feed for juvenile rainbow trout significantly promote growth rate, food conversion and overall culture results. Three levels of added MOS: 0.05%, 0.10% and 0.15% were incorporated in commercial pelleted feed and fed three and later two times per day. The experiment started with juveniles of 48±2.1 grams and lasted 90 days. The best growth result was obtained with the smallest (0.05%) MOS level, if compared to the control group and 0.1% and 0.15% MOS supplemented feed. The growth was improvedby11.5% with 0.05% MOS. The best feed conversion ratio (FCR) of 1.29 was found with 0.05% MOS supplement compared to 1.54 in the control group. FCR in 0.1% and 0.15% MOS treatments was 1.46, also significantly better than in the control group. The experiment shows that 0.05% MOS in trout feed is not fully successful in total elimination of salmonella colonies from fish intestine. But this is achieved with 0.1% MOS after only 30 days of experiment. The results of experiment point that smaller levels of MOS, if compared to previous research, are beneficial for rainbow trout juvenile culture.