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Rapid temperature-induced changes in the fatty acid composition of certain lipids in developing linseed and soya-bean cotyledons.

ABSTRACT: A change in ambient temperature caused marked alterations, over a 24h period, in the proportions of the unsaturated C18 fatty acids in 3-sn-phosphatidylcholine and 1,2-diacyglycerols during the development of soya-bean and linseed cotyledons. The molar proportion of oleate increased when the temperature was increased whereas that of linoleate or linolenate, depending on the species, increased when the temperature was lowered. Concomitant changes in the composition of 3-sn-phosphatidylethanolamine and triacylglycerols were small.

SUBMITTER: Slack CR

PROVIDER: S-EPMC1183911 | biostudies-other | 1978 Feb

REPOSITORIES: biostudies-other

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Project description:The aim of this experiment was to explore transcriptomic changes in the distal gut of Altantic salmon fed five experimental and two control diets. The experimental diets were isonitrogenous, isolipidic and isocaloric. They had similar content of fish meal (~22%) and similar total plant protein content (~45%), but differed in the contents of soya protein concentrate (SPC) and bean protein concentrate (BPC). These two ingredients were used to replace each other (either partially or fully) at the levels of incorporation ranging from 0 to 45%, with ~11% increments. As a result, the experimental diets contained either 45% SPC and 0% BPC (S45), 34% SPC and 11% BPC (S34B11), 22% SPC and 22% BPC (S22B22), 11% SPC and 34% BPC (S11B34) or 0% SPC and 45% BPC (B45). The S45 and B45 diets were single plant protein diets, while the others (S34B11, S22B22 and S11B34) were mixed plant protein diets. The control diets were enriched with fish meal (FM diet) or soybean meal (SBM diet) to provide negative and positive controls for gut inflammation (enteritis), respectively. The study was conducted at EWOS Innovation Research Facility in Dirdal (Norway) Atlantic salmon (Salmo salar L.) of the SalmoBreed strain were supplied as fertilized eggs and hatched on site. Mixed-sex juvenile salmon in groups of ~150 fish were transferred to 26 indoor tanks (0.6 x 0.6 x 0.6 m), with ~60 L of freshwater flowing at a rate of 3.9 L/min and continuous aeration. The temperature of water was regulated at 13°C and all animals were exposed to a constant light regime (24 h light/day). Fish were fed a commercial EWOS Start 1 diet and acclimated to the experimental conditions for 2 weeks, after which (at body mass ~1.5 g) they were subjected to a 56-day feeding trial. Tanks were randomly assigned to the dietary treatments, with 4 replicate tanks per each experimental diet (S45, S34B11, S22B22, S11B34 and B45) and 3 replicate tanks per each control diet (FM and SBM diets). Fish were fed to satiation prior to the feeding trial and during the dietary manipulation using automatic band feeders (Holland Technology, Norway). During the feeding trial, all fish in each tank had their biomass recorded on days 0 (start of experiment), 14, 28, 42 and 56 (end of experiment) for evaluation of growth performance.

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Rapid temperature-induced changes in the fatty acid composition of certain lipids in developing linseed and soya-bean cotyledons.

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