The study included 24 fatteners of Swallow-Belly Mangalitsa reared in different rearing and feed-ing/nutrition conditions. In the samples of the two groups (G1 and G2) of pigs, subcutaneous backfat tissue (SFT) was examined for the chemical composition and fatty acid concentrations. The obtained results of the analyses of solid fatty tissue show that the average share of protein and fat in samples of solid fatty tissue was 1.62 ± 0.36% and 87.57 ± 6.50% for G1 and 1.31 ± 0.10% and 91.07 ± 1.43% for G2. The determined difference in the share of protein and fat was highly statistically significant (P < 0.0001). The same level of significance was determined for the proportion of linoleic (LA, 18:2 n-6) MUFA, PUFA and n-6 fatty acids (P < 0.0001). The determined proportion of water was higher in the G1 group (4.94%) compared to G2 (4.44%), while the proportion of palmitoleic acid (PA, 16:1) was lower in the G1 group compared to G2 (3.01: 4.07%). The determined differences for both traits were statistically significant (P < 0.05). No statistically significant dif-ference was found for the share of ash and the share of other fatty acids, SFA, n-3 and n-6/n-3 (P>0.05). In the research, it was determined that the animals from the G2 group had a higher share of n-3 fatty acids (2.48%) compared to the animals from the G1 group (1.87%) and that the determined n-6/n-3 ratio was better in the G2 group compared to the G1 group (4.97:7.83). The best omega-6: omega-3 ratio should be 2:1. Humans get too much omega-6 in the diet and it's usually 5:1 to 10:1 in the human diet. Studies show that lowering the ratio of omega-6 (from vegetable oils) to omega-3 (from fatty fish, meat, fats and some vegeta-ble oils) fatty acids is important for the reduction of the risk of developing malignant and cardiovascular diseases, inflammatory conditions and some forms of depression.

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