¹Ternopil Ivan Pului National Technical University, Faculty of Engineering of Machines, Structures and Technologies, Department of Food Biotechnology and Chemistry, 46001, UKRAINE
²Stepan Gzhytskyi National University of Veterinary Medicine and Biotechnologies Lviv, Faculty of Social Development and Health, Department of Veterinary-Sanitary Inspection, 79010, UKRAINE
³Stepan Gzhytskyi National University of Veterinary Medicine and Biotechnologies Lviv, Faculty of Social Development and Health, Department of Veterinary-Sanitary Inspection, 79010, UKRAINE
⁴Higher Educational Institution, Podillia State University, Faculty of Veterinary Medicine and Technologies in Livestock, Department of Veterinary Obstetrics, Pathology and Surgery, 32300, UKRAINE DOI : 10.9775/kvfd.2022.27513 The main source of estrogen supply of steroid origin in the organism of consumers is milk and dairy products, which consume 60 to 80% of these hormones. Excess estrogen, including 17β-estradiol in the serum, has been linked to female and male genital cancers. The purpose of the search was to determine the amount of 17β-estradiol in milk on various farms in Ukraine and during its processing at the dairy plant. The determination of 17β-estradiol in cow"s milk samples was performed by enzyme-linked immunosorbent assay. It was found that the average value of 17β-estradiol content in raw milk obtained during the day on one farm does not depend on the time of milk production. At the same time, the content of 17β-estradiol in whole milk from one herd changes significantly during the year of its receipt. Mixing whole milk from different farms at the processing plant does not lead to a significant difference in 17β-estradiol content compared to milk produced on a particular farm in the region. It was found that whole milk with a higher mass fraction of milk fat contains more 17β-estradiol. Separating milk influences the distribution of 17β-estradiol between cream and skim milk. The amount of 17ß-estradiol in skim milk was almost 5-7 times less than in cream. Therefore, to possibly reduce the daily intake of 17β-estradiol and dairy products during consumption, it is necessary to reduce the mass fraction of fat in them. Keywords : 17β-estradiol, Whole milk, Skim milk, Cream