Effect of propolis and bee pollen on the biochemical blood parameters of young rabbits

In modern commercial rabbit production, the post-weaning period is one of the most critical stages of rearing young rabbits, as it is associated with the development of the digestive system and an increased metabolic load on the organism. Therefore, the search for natural biologically active feed additives capable of supporting the physiological status of animals without adversely affecting the major metabolic parameters is of considerable interest. The aim of this study was to evaluate the effects of administering different doses of bee pollen and propolis on the biochemical blood parameters of rabbits between 34 and 76 days of age. Rabbits in the control group received a basal diet and drinking water without supplements. Rabbits in the experimental groups received a 10% alcoholic solution of propolis in their daily drinking water at doses of 80 μL/kg body weight (Group 1) and 160 μL/kg body weight (Group 2). Bee pollen was diluted with water and administered throughout the day at doses of 100 mg/kg body weight and 200 mg/kg body weight to the rabbits of Groups 3 and 4, respectively. Blood samples were analyzed for selected indicators of protein, lipid, and mineral metabolism. Administration of bee products resulted in changes in the investigated biochemical blood parameters, indicating a metabolic response of young rabbits to the supplementation with biologically active organic additives. The most informative changes were observed in total protein and urea concentrations, reflecting alterations in protein metabolism. Changes in the activities of aminotransferases (AST and ALT) were also recorded in the experimental groups, suggesting stabilization of the enzymatic profile of the animals. A dose-dependent effect of bee pollen and propolis on the organism of weaned young rabbits was established.