title: Physical activity-induced alterations on tissue lipid composition and lipid metabolism in fattening pigs.
abstract: In a first experiment one group of pigs was maintained in free-range conditions according to the traditional way in a Mediterranean forest (exercised-1) and another group was housed individually and received acorns (sedentary-1). In a second experiment two groups of pigs were fed a mixed diet for the whole experimental period. One of these groups was housed individually in 8m(2) pens (sedentary-2). The other group was housed in a corridor and forced to walk daily (exercised-2). The subcutaneous fat and neutral lipids of muscle from the exercised pigs fed acorns had higher C18:1n-9, MUFA, C18:1/C18:0, MUFA/SAT and lower C16:0 and SAT when compared with the fat from the pigs fed acorns in confinement. Those exercised animals fed the mixed diet had also lower C16:0 and SAT in subcutaneous fat and lower SAT and higher C18:2, C18:3, PUFA and MUFA/SAT in neutral lipids when compared with the sedentary pigs, which may indicate that delta-9-desaturase activity was higher in exercised than in sedentary pigs. Exercised pigs had higher acid and neutral esterases and lower neutral lipase activity than sedentary pigs. No differences in the α-tocopherol concentration and TBARS values of meat samples among the pigs that received a mixed diet either exercised or sedentary were observed. The moderate exercise reduced the postprandrial concentrations of triglycerides in plasma, but did not reduce other plasma levels.
authors.affiliation: Departamento de Producción Animal, E.T.S.I. Agrónomos, Universidad Politécnica de Madrid, 28040 Madrid, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Daza
authors.forename: A I
authors.initials: AI
authors.lastname: Rey
authors.forename: A
authors.initials: A
authors.lastname: Olivares
authors.forename: G
authors.initials: G
authors.lastname: Cordero
authors.forename: F
authors.initials: F
authors.lastname: Toldrá
authors.forename: C J
authors.initials: CJ
authors.lastname: López-Bote