In the present study, the effect was investigated of administering an oral electrolyte solution(Glutellac®) to newborn Belgian blue calves on their vitality, the acid-balance in the blood, andtheir passive immunity. Twenty newborn calves were incorporated in the study, of which ten wereadministered a placebo and ten were administered Glutellac®. Only three calves showed metabolicacidosis. The group, which was administered Glutellac®, showed a significant higher base excess at twohours (p < 0.05), six hours (p < 0.001) and twelve hours (p < 0.001) after birth. Clinically and in termsof IgG absorption capacity, there were no significant differences between both groups. In conclusion,it can be stated that the administration of Glutellac® to Belgian blue calves without metabolic acidosisimmediately following birth by caesarean section beneficially influences the base excess.