title: Age-related changes in intramuscular and subcutaneous fat content and fatty acid composition in growing pigs using longitudinal data.
abstract: The evolution of intramuscular fat (IMF) and subcutaneous backfat (SB) content and fatty acid composition with age was investigated. A repeated sampling scheme (n=517) for longissimus dorsi (LM) and SB specimens was performed from 160 to 220 days on 216 purebred Duroc barrows. IMF content increased linearly with age at a rate of 0.05%/day, with major compositional changes occurring in C18:1 and C18.2, which increased and decreased by around 4%, respectively. Backfat thickness increase rate declined with age, showing similar compositional changes to IMF but halved in magnitude. Fat content itself also influenced fat composition. At a fixed age, both saturated (SFA) (C16:0) and monounsaturated (MUFA) (C18:1) increased with IMF but only SFA (C16:0 and C18:0) with SB. Aging mostly affected MUFA while fatness SFA. A delay in age at slaughter will enhance IMF and C18:1 in relation to overall fatness but at expense of decreasing body and loin growth rate.
authors.affiliation: Departament d'Enginyeria Química, Agrària i Tecnologia Agroalimentària, Universitat de Girona, Campus de Montilivi, Girona, Spain.
authors.forename: L
authors.initials: L
authors.lastname: Bosch
authors.forename: M
authors.initials: M
authors.lastname: Tor
authors.forename: J
authors.initials: J
authors.lastname: Reixach
authors.forename: J
authors.initials: J
authors.lastname: Estany
mesh_terms: D000367:Age Factors; D000818:Animals; D001823:Body Composition; D004041:Dietary Fats / Q000378:metabolism*; D005227:Fatty Acids / Q000378:metabolism*; D005229:Fatty Acids, Monounsaturated / Q000378:metabolism*; D008137:Longitudinal Studies; D008297:Male; D008460:Meat / Q000032:analysis*; D018482:Muscle, Skeletal / Q000378:metabolism*; D050151:Subcutaneous Fat / Q000378:metabolism*; D034421:Sus scrofa / Q000254:growth & development / Q000378:metabolism*
chemical_list: D004041:Dietary Fats; D005227:Fatty Acids; D005229:Fatty Acids, Monounsaturated