The aim of our work was to study the content of selenium in the trophic chain "soil-plant- animal" in Ural soil and climatic zone. Se content in the feed depends on its amount in the soil. When analyzing the Se concentration depending on the horizon depth, unified dynamics is observed for all zones; regardless of the element content in the surface soil layer, an increase in selenium concentration is observed in the lower horizon layers, and the difference could vary between the surface layer and the depth of 100 cm from 1.3 up to 4.5 times. Selenium status was examined in the blood of cattle originating from 4 farms (10% of animals randomly selected) using the atomic absorption spectrometry. Statistical data processing was performed in the IBM SPSS Statistics 20.0 program (IBM Corp., USA), non-parametric Spearman criterion/independent-samples Mann-Whitney U-test. The studied animals were not supplied with additional selenium. Analysis of data obtained at one of the farms in the Ural region revealed the selenium content in the cows��� blood was below normal (6.33 ��mol/L taken as normal) by 3.5 times, and in the calves��� blood by 2.9 times. Se level at the second farm was 10 times lower than normal, at the third farm 6.6 times lower. Se content in the blood of cows and calves at the fourth farm was at the lower normal limit (3.80 ��mol/L). Against this background, reproductive dysfunction was observed in cows at all farms included in the study: increased retention of fetal membranes after parturition by 1.5���2.3 times, abortions by 1.7���2.7 times, decrease in cows��� pregnancy rates by 12���24%. Thus, data obtained indicate a necessity in determining the trace elements��� content in soil and feed and to substitute selenium to improve the cows��� reproductive function.