Utjecaj hranidbe lanom na sadržaj alfa-linolenske kiseline i njenih dugolančanih n-3 metabolita u svinjskom mesu i leđnoj slanini.

The aim of this study was to examine the influence of dietary linseed on fatty acid profile and lipid oxidation in pig muscle (m. longissimus dorsi) and back fat. Sixty PIC fatteners were equally allotted to dietary treatments at an initial live weight of about 27 kg and fed for 90 days with a control or a linseed diet (3% linseed, 105 mg/kg of α tocopheryl acetate). Growth performance, carcass traits and meat quality were not affected by feeding linseed to any significant extent. No differences were found in the proportion of saturated, monounsaturated and polyunsaturated fatty acids of muscle or back fat between diets. However, both muscle and back fat from the linseed diet had a significantly higher n-3 and polyunsaturated fatty acid proportion (%), including C18:3n-3, C20:5n-3 and C22:6n-3, and a lower n-6/n-3 ratio compared with the control diet (4.3 vs.1.3, 1.9 vs. 0.44, 0.76 vs. 0.14, 0.17 vs. 0.12, and 4.6 vs. 17.4 ratio in muscle, and 5.3 vs.1.2, 4.3 vs. 0.87, 0.07 vs. 0.02, 0.04 vs. 0.02, and 2.8 vs. 15.8 ratio in back fat, respectively). Lipid oxidation, measured as 2-thiobarbituric acid-reactive substances, was similar in muscle when feeding both diets after cold storage up to 6 days, but more developed in back fat when feeding the linseed diet after 3 days of cold storage. This study confirmed that continuous feeding of pigs with a relatively low level of linseed can produce a pork meat enhanced with both C18:3n-3 and pre-formed C20-22n-3, and with nutritionally optimized n-6/n-3 ratios, without adverse effects on fatteners’ performances, carcass traits and meat quality.Cilj rada bio je istražiti utjecaj dodatka lana u hranidbi svinja na sastav masnih kiselina i oksidaciju lipida u mesu (m. longissimus dorsi) i leđnoj slanini. Šezdeset PIC nazimica i muških kastrata početne mase oko 27 kg ravnomjerno je bilo podijeljeno u dvije skupine i hranjeno tijekom tova (90 dana) uobičajenom krmnom smjesom ili krmnom smjesom s 3% sjemena lana i 105 mg/kg α-tokoferol acetata. Hranidba lanom nije značajnije utjecala na dnevni prirast, svojstva trupa i kakvoću mesa tovljenika. Između skupina nisu postojale značajnije razlike u sastavu zasićenih, jednostruko nezasićenih ili višestruko nezasićenih masnih kiselina mesa ili leđne slanine. Međutim, pri hranidbi lanom u odnosu na uobičajenu hranidbu utvrđen je značajno viši udio (%) n-3 masnih kiselina, uključujući C18:3n-3, C20:5n-3 i C22:6n-3, i niži n-6/n-3 omjer u mesu (4,3% prema 1,3%, 1,9% prema 0,44%, 0,76% prema 0,14%, 0,17% prema 0,12% i 4,6 prema 17,4) i leđnoj slanini (5,3% prema 1,2%, 4,3% prema 0,87%, 0,07% prema 0,02%, 0,04% prema 0,02%, i 2,8 prema 15,8). Oksidacija lipida, mjerena reaktivnim supstancijama na 2-tiobarbituratnu kiselinu, bila je podjednaka nakon obje vrste hranidbe tijekom pohrane mesa na hladnom do 6 dana, ali jače razvijena nakon hranidbe lanom u leđnoj slanini trećeg dana pohrane. Dobiveni rezultati potvrđuju da trajna hranidba tovljenika s relativno niskom razinom lana u obroku može proizvesti svinjsko meso s povećanim udjelom C18:3n-3 i preformiranih C20 22n-3, s nutritivno usklađenim n-6/n-3 omjerom bez negativnih učinaka na tovne performanse i kakvoću trupova i mesa