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The results of the study of blood serum biochemistry and bactericidal activity of the herd replacements sheep of the Tsigai breed, grown in the Prisivash lowland of the Crimean Peninsula are presented. Blood samples were processed in certified laboratories of the organizations of the Republic of Crimea in 2020-2022. Blood serum parameters were determined on the basis of 12 samples of rams and 12 samples of gimmers. A Vitalab Flexor E photometric analyzer was used to process biochemical parameters, a Multiskan thermostatically controlled device was used to process bactericidal activity of blood serum. The animals showed normal creatinine and urea levels: 87.5 ± 0.7 and 6.6 ± 0.2 mmol/l in rams, respectively, and 85.5 ± 1.2 and 6.4 ± 0.4 mmol/l in gimmers. The reduced glucose level (1.6 ± 0.1...1.7 ± 0.1 mmol/l) in the blood serum of young animals is probably related to active exercise in hot weather. The observed amount of transamination enzymes caused an increase in the Ritis coefficient in rams up to 2.5 units, in gimmers up to 3.8 units, which indicates the load on the heart muscle of the animals during long walks in the heat. Potassium content near the lower normal limits (4.3 ± 0.01...4.7 ± 0.1 mmol/l) and slightly reduced phosphorus level (1.3 ± 0.01...1.2 ± 0.01 mmol/l) indicate the need for additional supplementation of growing young animals with mineral premixes in summer period. Average BSBA values increased in gimmers, significantly exceeding this index in comparison with rams by 45.826.6 abs.% (p ≤ 0.001). In rams, the highest BSBA values were observed for S. aureus at 10 hours of exposure (36.82 ± 2.19%), while the growth of E. coli was suppressed to 7.23 ± 1.34%, which is, among other things, the factor provoking digestive problems. In the gimmers, a satisfactory skin condition was recorded due to the high level of BSBA against S. aureus (up to 35.30 ± 2.64% at 10 hours of exposure).

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