THE EFFECTS OF BREED AND FEEDING REGIME ON THE CHEMICALCOMPOSITION OF PIG BACK FAT AS A POTENTIAL RAW MATERIALFOR BIODIESEL PRODUCTION

The aim of this study was to evaluate the chemical composition of the back fattissue of mangalitsa pig and meaty pig breeds and their crosses, and the pigs thatwere fed with feed that was enriched or unenriched with oil, from the aspect of theproduction of biodiesel, where the starting material for the fuel would be the fattissue of pigs. By examining the impact of breed and oil content in feed, it wasfound that chemical parameters (fat, water, protein, saturated and unsaturated fattyacids) show statistically significant variation under the influence of these factors.The highest fat content (89.39%), which is essential for conversion of fat intobiodiesel, was found in back adipose tissue of mangalitsa breed, while the lowestfat content (86.10%) was found in the back fat tissue of meaty breeds and theircrosses. Favorable ratio of saturated to unsaturated fatty acids (37.92% : 62.07%),on which some physical properties of the fuel depend, was found in the back fattissue of pigs that were fed with feed enriched with oil, and the largest proportionof saturated fatty acids, i.e. the most unfavorable fatty acid composition(40.90% : 59.09%) was found in the back fat tissues of pigs that were fed with feedunenriched with oil. The lowest content of saturated fatty acids and water (7.44%),as the key factors that determine the cetane number of the fuel and the fuelproduction process, indicates that the most suitable raw material for the productionof biodiesel is the fat tissue of pigs that were fed with food that contained a certainamount of oil.