The aim of the research was to evaluate the impact of adding halloisyte into diet, in amount of 1 and 2%, on the fatty acids profile in longissimus dorsi muscle, liver and backfat fat during growing-finishing period. It was affirmed that the highest level of saturated acid (SFA) was found in liver tissue (46.63–52.63%), and the lowest in muscle tissues (36.72–39.33%); the highest level of monounsaturated acid (MUFA) was found in muscle tissues (49.65–52.22%) and the lowest in liver tissues (19.39–23.06%); the highest level of polyunsaturated acid (PUFA) was found in liver tissues (27.98–30.31%) but 2–3 times lower was found in pork fat and muscle tissues. The influence of halloisyte was marked by favourable and statistically significant (p<0.05) fall of SFA content (muscles, liver, backfat), whereas MUFA and PUFA level increased and n-3 acids (muscles, backfat) level increased twice. The more favourable profile of fatty acids in those groups should be explained by the impact of halloisyte on the metabolism of feed fat.

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