Muscle fibre membrane lipid composition in musculus bicepsfemoris of pigs reared in indoor or outdoor systems

Ali, Omeralfaroug and Petrási, Zsolt and Donkó, Tamás and Fébel, Hedvig and Mézes, Miklós and Szabó, András (2021) Muscle fibre membrane lipid composition in musculus bicepsfemoris of pigs reared in indoor or outdoor systems. JOURNAL OF ANIMAL AND FEED SCIENCES, 30 (3). pp. 238-247. ISSN 1230-1388

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Abstract

Two fundamentally different keeping systems, outdoor and indoor (10 weaned-pigs/system), were used with a quasi-identical feeding process. At 120 kg live body weight, animals underwent a computerized tomography scanning, during which musculus biceps femoris and blood samples were collected to determine the fatty acid (FA) profile of skeletal muscle phospholipids and plasma oxidative stability, respectively. The growth showed a fallback in the outdoor rearing system (another 8 days were needed) during the finishing stages. From the total body volume (cm3 ), the muscle (%) increased and fat (%) decreased in outdoor animals. The FA total saturation level, total monounsaturation level and thrombogenicity index were higher in muscular phospholipids. In contrast, proportional decreases in totals of polyunsaturation and omega-6 FAs, and in the unsaturation and peroxidation indices were detected. Among omega-3 FAs, C18:3n3 and C22:6n3 proportions were higher in outdoor pigs, and thus, the omega-6:omega-3 ratio declined. The outdoor rearing system did not influence the plasma antioxidant system. Overall, outdoor production altered the skeletal muscle fibre membrane FA profile and total body characteristics, but it compromised the pig growth.

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