The research was executed for 30 calves in age, beginning from 7 days of their life. Through period of 1 week the Humowitan preparation (50 g/day/per head) or the propolis extract (400 mg/day/ per head) was fed together with milk. In aim of qualification of applied preparations influence onto calves’ organisms, Hb, Ht, number of red blood cells, number of white blood cells and MCV, MCH, MCHC as well as acid–base equilibrium parameters was marked in full blood, whereas total protein level and its fractions was marked in serum. The additions applied for calves caused appeasement of diarrhea symptoms, partial compensation of respiratory acidosis as well as enlargement of body weight increases. Applied additions have an advantageous effect onto total protein content and γ- globulins in blood serum of calves.

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