Burns of 20% of rat skin caused a decrease in content of albumins and gamma-globulins in blood and simultaneous increase in content of alpha 1- and alpha 2-globulins. Content C17 : 1 and C19 : 1 monoenoic fatty acids was decreased in blood and liver tissue of the rats with burns. These patterns were normalized after administration into the animals of synthetic anabolic steroid nerobolyl at a dose 5 mg/kg. Burning castrated male rats led to a decrease in concentration of albumins, alpha 1- and alpha 2-globulins in blood with simultaneous increase of monoenoic fatty acids in blood and liver tissue. Nerobolyl normalized these patterns at a dose 20 mg/kg, while a dose 5 mg/kg was distinctly less effective.