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10 pages, 5 tables, 4 figures.[EN] The triacylglycerol (TGs) composition of 1, 560 samples of subcutaneous fat of Iberian purebred and crossbred (iberianxDuroc) pigs reared extensively on three different\udfeeding systems: montanera (M), cebo (C) and recebo (R), were determined. Seventeen TG species were identified by Gas Chromatography and six of them (POO, PSO, POL, OOO, SOO, OOL) accounted for 75 %. Significant\uddifferences (p < 0.01) were found for the majority of TG species among the three types of feeding. The effect of the duration of montanera on the TG composition was also\udexplored and a significant positive correlation (p < 0.05) was found with the following TGs: OOO, SOL, OOL and OLL. After 110 days of Montanera, all the samples showed a percentage of OOO and OOL over 9.5 % and 4.5% respectively. Genotype also showed a significant effect (p < 0.01) on the TG composition. Principal Component and\udLinear Discriminant analyses were applied to the data set. No clear separation among the three groups (M, R and C) according to the TG profile was achieved. Only M and C\udgroups were clearly separated according to their TG composition.[ES] Se ha determinado la composición de trigliceridos (TGs) en 1560 muestras de grasa subcutánea de cerdo ibérico puro y cruzado (ibericoxDuroc) criados en régimen extensivo en tres sistemas de alimentación: montanera (M), cebo (C) y recebo (R). Diecisiete TGs se han identificado mediante Cromatografía de Gases, y seis de ellos (POO, PSO, POL, OOO, SOO, OOL) representan el 75 %. Se encontraron diferencias significativas (p < 0.01) para la mayoría de los TGs entre los tres tipos de alimentación. También se investigó el efecto del tiempo de montanera sobre la composición de TGs, encontrándose una correlación positiva (p < 0.05) con los siguientes TGs: OOO, SOL, OOL y OLL. Tras 110 días de Montanera, todas las muestras presentaron % de OOO y OOL por encima del 9.5 % y 4.5 % respectivamente. El genotipo también mostró un efecto significativo (p < 0.01) sobre la composición de TGs. Se aplicó Análisis de Componentes Principales y Análisis Lineal Discriminantes a los datos obtenidos. No se obtuvo una buena separación entre los tres grupos de alimentación (M, R y C), sólo para los grupos de M y C se obtuvo una clara separación en base a la composición de TGs.Peer reviewe

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A multivariate study of the triacylglycerols composition of the subcutaneous adipose tissue of Iberian pig in relation to the fattening diet and genotype