The percent of soya oil instead of corn meal and 0.05% of DL-alpha-tocopherol was added to food mixtures used for gilts weighing 30 kg fattened for 40 days. The best weight gains were noted in pigs fed food enriched with soya oil and vitamin E. Soya oil significantly increased the content of linoleic acid and decreased the level of oleic and palmitinic acids in heart muscle. It does not affected the content of unsaturated fatty acids in the heart. Vitamin E protected fats against oxidative processes and it does not influenced the proportions between fatty acids in the heart.