Linseed addition in the diets of pigs had no negative effect on the characteristics of fattening and quantitative and qualitative parameters of carcass values in both barrows and gilts. The highest feed conversion value and the lowest ash
content were observed in barrows fed with linseed. Linseed addition in the diet increased the PUFA content, n-3 PUFA content, and PUFA/SFA ratio and decreased the MUFA content, MUFA/PUFA, MUFA/SFA, and n-6/n-3 PUFA ratios and
thrombogenic index. Linseed feeding has less detrimental effects concerning the atherosclerosis and coronary thrombosis risk associated with the consumption of pig meat. The linseed-containing diet radically approximated the n-6/n-3 PUFA
(control vs. experimental groups; 17.38 and 19.99 vs. 1.87 and 3.92) and thrombogenic index (1.33 and 1.28 vs. 0.80 and 0.85) in meat of barrows and gilts to the values recommended by the WHO.