EFFECT OF DIET ON THE FATTY-ACID COMPOSIT ION OF ADIPOSE AND MUSCULARTISSUE IN IBERIAN PIGS

The fatty acid composition of total, apolar and polar lipid fractions from adipose and muscular tissues of Iberian pigs was determined. Anim als were fed on diets of pasture and acorns (montanera), acorns and ce reals (recebo) or cereals (cebo). The principal fatty acids in the tot al and apolar lipid fractions from muscular tissue were C-18:1 (39-51% ), C-16:0 (21-27%), C-18:0 (11-21%), C-18:2 (3-7%) and C-18:3 (1.7-5.4 %). Significant differences were observed only in some cases. In the t otal lipid fraction from the muscular tissue significant differences ( p less than or equal to 0.05) were found between all three batches for the C-16:1 fatty acid and between the cebo batch and the others for b oth C-18:1 and C-18:0. In total lipids from the adipose tissue, signif icant differences were found for both C-16:1 and C-18:3 between all th ree batches, and for C-16:1 and C-18:1 differences were observed only between the montanera batch and the others. The differences between ba tches in the apolar and polar fractions were smaller than those for to tal lipids. A 100% partition among the three different diets studied w as not obtained when a stepwise discriminant analysis was applied.