The experiment described in the paper focused on the effects of complementary and excess diet supplementation on body weight changes and fat tissue accumulation. Untreated wheat, corn grains, and barley grits in the original diet were isocalorically substituted with wheat flour, sucrose, and minerals (calcium, magnesium, chromium, and zinc). The feed in which whole cereal grains were replaced by flour and sucrose did not significantly affect the amount of feed consumed, body weight gains nor fat accumulation. Diet supplementation with selected mineral components to compensate for the deficiencies caused by the modification produced, in the female rats, significantly reduced body weight gains (0.3± 1.9 g/100 g diet) and perivisceral fat accumulation (pericardial fat 0.009±0.005 g/100 g diet; peri- intestinal 0.790±0.575 g/100 g diet), whereas significantly increased muscle fat content (6.49±0.15 g). At comparable body weight gains, the male rats showed a significantly higher perivisceral (pericardial fat 0.039±0.008 g/100 g diet; peri-intestinal 0.769±0.152 g/100 g diet) and intramuscular fat accumulation (6.49 ±0.15 g). Excess supplementation resulted, in both sexes, in a significantly reduced feed consumption accompanied, however, by significantly higher body weight gains per unit feed consumed (females 4.8±2.3g/100g diet; males 3.7±3.1 g/100 g diet) as well as by a significantly higher accumulation of perivisceral and intramuscular fat (females 0.058±0.024 g/100 g diet; 2.060±0.676 g/100 g diet; 7.53±0.12 g; males 0.42±0.16 g/100 g diet; 0.934±0.305 g/100 g diet; 5.48±0.16 g, respectively). The modified diet and its supplementation resulted in significant changes in the contents of individual fatty acids in the perivisceral fat, the changes involving mainly an increase in saturated and monounsaturated acids and a reduction in polyunsaturated acids, particularly in the males.
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