EN
Three groups of 25 growing pigs (pbz x wbp) x Pietrain each initially weighing 50 kg were fed with loose full feed mixtures. The experimental factors consisted of adding the following ingredients to their diets: 8% soybean oil, containing 14.9; 53.2 and 7.8% of oleic, linoleic and linolenic acid for both group II and III, and vitamin E - 500 mg «-tocopherol acetate (group III). At 105 kg body weight the animals were slaughtered and the carcass analysed. Samples of the longissimus dorsi, liver and backfat were chemically analysed. Blood samples from the zygomatic vein were collected three times: at 80 kg and 90 kg body weight and directly before slaughter. The vitamin E, cholesterol and fatty acid composition in the samples was determined. The 8% soybean oil additive to the diet increased daily gains and elevated the HDL cholesterol content in the blood. The n-3 and n-6 PUFA contents in the longissimus dorsi muscle, liver and backfat of fattening pigs also increased. Simultaneously, adding 80 g soybean oil and 500 mg «-tocopherol acetate to the diets enabled pork with a higher vitamin E and essential fatty acid content but containing a lower level of total cholesterol in backfat to be obtained.