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Information × Registration Number 0226U000183, (0123U105340) , R & D reports Title To investigate the biological value of beef for the introduction of sources of essential polyunsaturated fatty acids and Selenium into the feeding diet of cattle. popup.stage_title Дослідити інтенсивність росту відгодівельних бугайців та особливості накопичення у їх тканинах незамінних поліненасичених жирних кислот родин n-3 і n-6 за введення у їх раціон джерел есенціальних жирних кислот і препаратів Селену. Head Diachenko Oleksandr B., Кандидат сільськогосподарських наук Registration Date 06-01-2026 Organization Institute of Agriculture of the Carpathian Region of the National Academy of Agrarian Sciences of Ukraine popup.description1 To determine the intensity of growth of fattening cattle and the peculiarities of the accumulation of essential polyunsaturated fatty acids of the n-3 and n-6 families and Selenium in their tissues for the introduction of sources of essential fatty acids and selenium preparations into their diet in order to increase their meat productivity and improve the biological value of beef . popup.description2 A comparative assessment was conducted of the content of essential polyunsaturated fatty acids (PUFAs) of the ω-3 and ω-6 families and selenium in the diet, as well as their levels in the liver and skeletal muscles and the average daily weight gains of young bulls. The basal diet was found to be deficient in α-linolenic acid and selenium, which justifies the inclusion of additional sources of these nutrients to ensure adequate biological and nutritional value of feeds and balanced animal nutrition. The use of linseed and sunflower oils as sources of ω-3 and ω-6 PUFAs effectively modified the lipid composition of the diet, significantly increasing α-linolenic acid intake and reducing the ω-6/ω-3 ratio to a physiologically optimal level. Such dietary modification had a positive effect on meat productivity: animals in the experimental groups demonstrated significantly higher average daily weight gains compared with the control group. The chemical composition of meat (moisture, protein, fat, and ash content) did not change significantly; however, a tendency toward increased fat content in the longissimus dorsi muscle of experimental animals was observed, which may be associated with enhanced lipid assimilation, improved feed efficiency, and increased dietary energy density. Supplementation with selenium in the form of sodium selenite compensated for its deficiency in the basal diet and resulted in a significant increase in selenium concentration in the liver and skeletal muscles. The content of ω-3 and ω-6 PUFAs in these tissues increased mainly due to higher ω-3 fatty acid levels, leading to a decrease in the ω-6/ω-3 ratio to 2.0–2.2:1, which indicates improved lipid metabolism, physiological balance, and better nutritional quality of meat. Combined dietary enrichment with PUFAs and selenium can be considered an effective strategy to enhance the biological (nutraceutical) value and overall quality of beef, meeting current requirements of healthy human nutrition. Product Description popup.authors Vlizlo Vasyl Vasylovych Rivis Yosyp Fedorovych Tymchyshyn Iryna M. popup.nrat_date 2026-01-06 Close