The comparative study was performed on 200 European brown hares. Group I consisted of 35 clinically healthy hares kept in cages. Group II comprised 165 clinically healthy hares caught alive in their natural environment. Following the premedication, arterial and venous blood was drawn from the hares of the two groups studied. In the arterial blood, the acid-base balance (ABB) parameters were determined - blood pH, pCO₂, t CO₂, HCO₃⁻, BB, and BE. In the venous blood, the activity of AST, ALT, and FA, concentration of urea, creatinine, total protein, albumins, globulins, cholesterol, triglycerides, glucose, WBC, RBC, Hb, and Ht were determined. In addition, concentrations of Ca²⁺, P, Mg²⁺, Na⁺, K⁺, and Cl⁻ were measured in the blood serum. It was demonstrated that only the contents of globulins and triglycerides were similar in groups I and II. Concentration of electrolytes and ABB parameters were close to each other in the two studied groups, except for concentration of Mg²⁺ and inorganic P, and CO₂ molecular pressure. In the light of the obtained results a question remains opened: whether successful breeding, understood as an increase in the number of offspring of the reintroduced individuals, is more likely to occur in the case of animals caught alive and, adapted to living in their natural environment, or in the case of caged animals.
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