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Fatty acids have a significant impact on the overall metabolic processes in the body. One of the links of the general metabolism is the formation of peroxidation products during the oxidation of fatty acids. The aim of our work was to investigate the relationship between the content of fatty acids and lipid peroxidation products under copper, selenium, and manganese deficiency. The study was conducted on calves of the Ukrainian meat breed aged 6 months. An appropriate dose of deficient trace elements was added to the basic diet of the experimental groups. Determination of the spectrum of fatty acids in blood serum was performed using a gas chromatograph. The diet with copper, selenium and manganese increased the content of short-chain saturated fatty acids and the level of monounsaturated fatty acids decreased. The obtained results indicate the influence of individual fatty acids on the formation of peroxidation of products as a result of increased oxidation of the corresponding substrates. It is shown that deficient copper, selenium and manganese affect the correlation between fatty acids and peroxidation products. The revealed regularities can become the basis for the development of sound strategies for the mineral nutrition of beef cattle by including deficient trace elements and polyunsaturated omega fatty acids. In addition to obtaining important data on the relationship between biochemical processes in the body of beef cattle, the study of the influence of dietary strategies on the nutritional value and fatty acid composition of beef is provided by our further research. [ABSTRACT FROM AUTHOR]