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Utilization of dietary starch and glucose tolerance in juvenile chinook salmon (Oncorhynchus tshawytscha) of different strains in seawater |
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| Authors: | Carol Nelson Mazur D A Higgs E Plisetskaya B E March |
| Institution: | (1) Department of Animal Science, University of British Columbia, Vancouver, BC, Canada, V6T 1Z4;(2) West Vancouver Laboratory, Department of Fisheries and Oceans, West Vancouver, BC, Canada, V7V 1N6;(3) School of Fisheries, University of Washington, Seattle, WA 98195, USA;(4) Department of Animal Science, University of British Columbia, Vancouver, BC, Canada, V6T 2A2 |
| Abstract: | Juvenile chinook salmon of three strains responded to inclusion of 28.7% of gelatinized starch in the diet with different degrees of reduction in growth rate and feed efficiency relative to control fish of the respective strains fed a low-starch, high-lipid diet of similar protein (46%) and estimated metabolizable energy content (16 mJ/kg). The productive protein value of the diet was not reduced to the same extent by the high intake of starch. Carcasses of fish fed the high-starch diet contained higher concentrations of protein and lower concentrations of lipid than control fish. The accumulation of liver glycogen in response to the high-starch diet differed among strains. Glucose tolerance curves also varied among strains but were poorly correlated with plasma concentrations of insulin. Tolerance to glucose loading was improved in fish previously fed the high-starch diet. |
| Keywords: | chinook dietary carbohydrate glycogen glucose tolerance insulin genetic differences adaptation |
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