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Effect of a mannan oligosaccharide on the growth performance and immune status of rainbow trout (Oncorhynchus mykiss)

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Abstract

The objective of these experimental trials was to determine the effect of a mannan oligosaccharide (MOS) derived from the outer cell wall of Saccharomyces cerevisiae strain 1026 on the growth performance and immune status of rainbow trout. Two experiments were conducted, one with eight net cages and the other with eight raceways. The net cage experiment (42 days) involved 14,400 fish with an initial average weight of 30 g. The raceway experiment (90 days) was conduced with 40,000 fish with an initial average weight of 101 g. Both experiments compared a commercial extruded diet with and without 2,000 ppm MOS supplementation. The calculated daily feed was supplied in six equal rations. Body weight, feed intake, and mortality were recorded and samples were taken for analysis of indicators of immune status. All data were subjected to ANOVA, with a net cage or raceway regarded as an experimental unit. Significantly improved performance and immune status were observed in the net cage trial—improved weight gain of 13.7% (P < 0.01), reduced feed conversion ratio (FCR) (P < 0.05), reduced mortality (P < 0.01), and improved indicators of immune status (P < 0.01) for fish fed the MOS supplement compared with controls. Similar significantly improved performance was observed for the MOS-treated groups in the raceway trial—9.97% improved weight gain (P < 0.01), lower FCR (P < 0.01), and reduced mortality compared with the control treatment. In the raceway trials, however, only the indicators of immune status lysozyme concentration, APCA, and CPCA were significantly improved by MOS treatment (P < 0.05). These experimental trials demonstrated the ability of MOS to improve the growth performance, survival, and immune status of rainbow trout produced in net cages or raceways.

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Acknowledgements

This study received financial support from Alltech, Ireland, and the authors would like to thank the personnel of the trout farms for their kind help.

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Authors and Affiliations

  1. Trakia University, Stara Zagora, 6000, Bulgaria

    Y. Staykov & S. Denev

  2. Swiss College of Agriculture, Zollikofen, Switzerland

    P. Spring

  3. Alltech Inc., Livadi, Lixouri, Cephalonia, 28200, Greece

    J. Sweetman

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  1. Y. Staykov
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  2. P. Spring
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  3. S. Denev
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  4. J. Sweetman
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Correspondence to J. Sweetman.

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Staykov, Y., Spring, P., Denev, S. et al. Effect of a mannan oligosaccharide on the growth performance and immune status of rainbow trout (Oncorhynchus mykiss). Aquacult Int 15, 153–161 (2007). https://doi.org/10.1007/s10499-007-9096-z

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  • DOI: https://doi.org/10.1007/s10499-007-9096-z

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