Early nutritional intervention can improve utilisation of vegetable-based diets in diploid and triploid Atlantic salmon (Salmo salar L.)
2017
Clarkson, Michael | Migaud, Herve | Metochis, Christoforos | Vera, LM | Leeming, Daniel | Tocher, Douglas R | Taylor, John | Biotechnology and Biological Sciences Research Council | Biomar Ltd | Marine Harvest (Scotland) Ltd | European Commission | University of Stirling | Institute of Aquaculture | Institute of Aquaculture | Institute of Aquaculture | BioMar Ltd | Institute of Aquaculture | Institute of Aquaculture | 0000-0002-5404-7512 | 0000-0002-3299-0630 | 0000-0003-0999-055X | 0000-0002-8603-9410 | 0000-0003-4370-7922
The present study investigated nutritional programming in Atlantic salmon to improve utilisation of a vegetable-based diet. At first exogenous feeding, fry were fed either a marine-based diet (Diet Mstimulus, 80% fishmeal (FM)/4% fish oil (FO)) or a vegetable-based diet (Diet Vstimulus, 10% FM/0% FO) for 3 weeks. Subsequently, all fish were then fed under the same conditions with a commercial, marine-based, diet for 15 weeks and thereafter challenged with a second V diet (Diet Vchallenge, 10% FM/0% FO) for 6 weeks. Diploid and triploid siblings were run in parallel to examine ploidy effects. Growth performance, feed intake, nutrient utilisation and intestinal morphology were monitored. Fish initially given Diet Vstimulus (V-fish) showed 24 % higher growth rate and 23 % better feed efficiency compared with M-fish when later challenged with Diet Vchallenge. There was no difference in feed intake between nutritional histories, but increased nutrient retentions highlighted the improved utilisation of a V diet in V-fish. There were generally few significant effects of nutritional history or ploidy on enteritis scores in the distal intestine after the challenge phase as only V-triploids showed a significant increase (P
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