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Title

Trade-off effects of medium-chain fatty acids in the metabolic capacity and swim performance of gilthead sea bream fed different protein dietary sources

AuthorsMartos-Sitcha, Juan Antonio ; Simó Mirabet, Paula; Piazzon de Haro, María Carla ; Heras, Verónica de las ; Calduch-Giner, Josep A. ; Puyalto, Mónica; Tinsley, John; Sitjà-Bobadilla, Ariadna ; Pérez-Sánchez, Jaume
Issue Date13-Jul-2017
Citation11º Congreso de la Asociación Ibérica de Endocrinología Comparada (2017)
AbstractShort- and medium-chain fatty acids (SCFAs and MCFAs) are natural compounds present in both animal and plant tissues that play a key role on energy-dependent mitochondrial processes and intracellular signaling. Since cellular uptake and transport of SCFAs and MCFAs across the cell and mitochondria do not require the action of specific transporters, these compounds are considered ideal nutritive sources for a rapid energy uptake and utilisation. Experimental evidences show that inclusion of the C4 carboxylic acid (butyric acid, SCFA) exerts benefits upon the intestine of gilthead sea bream reversing some detrimental effects of extreme plant protein-based diets, but there is no information about the effects of C7 carboxylic acid (heptanoic acid, MCFA) in fish. The aim of this study was to explore the potential benefits of a commercial preparation of heptanoate sodium salt in a factorial design (2 x 2) with standard (D1 and D2) or low (D3 and D4) inclusion levels of fish meal (FM) as dietary protein source in an 11-weeks trial. Histopathological scoring of intestine did not reveal detrimental effects of dietary protein or heptanoate supplementation. Results of growth performance indicated a fast (SGR=2.26-2.32) and efficient (FE=0.91-0.94) growth with no changes in plasma Igf-I levels among fish fed the four experimental diets. Heptanoate supplementation (D2 and D4) increased plasma cortisol regardless of dietary protein source, whereas this MCFA increased plasma Gh concentration in D2 and decreased it in D4 fish. In addition, an improved swim performance evidenced by a greater critical swimming speed (Ucrit) was orchestrated i) by heptanoate in FM-based diet (D2) or ii) by the nutritionally-mediated changes through cortisol and Gh in D3 and D4 fish. In this sense, the reduction of Gh values produced by heptanoate in the low FM diet (D4) can be viewed as a protective measure to counteract disproportionate oxidative metabolic rates.
DescriptionTrabajo presentado en el 11º Congreso de la Asociación Ibérica de Endocrinología Comparada (AIEC), celebrado en Vigo (España), del 13 al 15 de julio de 2017
URIhttp://hdl.handle.net/10261/191108
Appears in Collections:(IATS) Comunicaciones congresos
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