Fatty acids profile of the subcutaneous backfat layers from Iberian pigs raised under free-range conditions.

摘要

The aim of this study was to investigate the fatty acid composition of the outer, inner and sub-inner subcutaneous backfat layers from Iberian pigs (swine) raised under free-range conditions. The pigs were fattened on acorns and grass under free-range conditions from 101 to 155 kg live wt. Proportions of C16:0, C18:0 and C20:0 were lower in the outer than in the inner layer, while the C12:0, C16:0 and C18:0 contents were higher in the sub-inner layer than in the inner layer. The outer layer had higher C15:1, C16:1 n-7, C17:1, C18:1 n-7 and similar C16:1 n-9, C18:1 n-9 and C20:1 n-9 proportions than the inner layer, while the subinner layer had lower C17:1, C18:1 n-9, C20:1, similar C15:1, C16:1 n-7, C18:1 n-7 and higher C16:1 n-9 proportions than the inner layer. Only the concn. of C18:3 n-3, C18:4 n-3 and C20:3 n-3 were lower in subinner than in inner layer. The content of all PUFA was higher in the outer than in the inner layer except for the C20:4 n-6 fatty acid. A tendency (P < 0.1) to a higher n-6-3 fatty acids ratio was found for the inner and sub-inner layers than for the outer layer. Significant correlation coeff. were observed between the proportions of C14:0, C16:0, C18:1 n-9, C18:2 n-6, C18:3 n-3 and C20:3 n-9 of the inner layer and sub-inner layer. The outer layer m.p. was lower than those of the inner and subinner layers, although no difference for m.p. between the inner and subinner layers was observed.