Blood counts vary significantly under the influence of feeding and keeping conditions. According to hematological indicators, one can determine the degree of metabolism in the body. The studies were aimed to identify the effect of selenium-containing feed supplement Bio-Sorb-Selenium on hematological indicators of goslings at different age periods (one-day-old goslings, 30 day-old and 60 day-old goslings). It was established that in one-day old goslings the morphological composition of blood was within the physiological norm and no difference between the groups was observed. At the age of 60 days, the goslings of the control group had less erythrocytes than ones of the experimental groups by 3.57 and 4.64 %, the hemoglobin content decreased by 4.37 and 7.28 %, the number of leukocytes – by 5.77 and 7.31 %, the total nitrogen content decreased by 3.73 and 7.41 %, the total protein content decreased by 5.67 and 7.21 %. The introduction of various dosages of Bio-Sorb-Selen into feed increased the content of calcium and inorganic phosphorus due to mineral components. The results obtained indicate the active nature of redox processes in the body of goslings of the experimental groups and increased activity of the hematopoiesis apparatus due to the intensive growth of goslings.

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