The study was designed to evaluate the effect of diet supplementation with linseed on the carcass charac-teristics, meat quality and oxidative stability as well as the composition of the fatty acids in M. longissimus lumbo-rum et thoracis (MLLT) and the backfat of fattening gilts. A total of 40animals were used, 20in the experimental and 20in the control group. The experiment proved that fattening the gilts fed with a linseed diet showed a lower content of backfat and intramuscular fat, but also a higher drip loss value and a higher pH of the meat. It also confirmed that the linseed diet positively influ-enced the fatty acid profile in the intramuscular fat and backfat.