The effect of controlled colostrum administration (timing of first intake, volume, and immunological quality) on first-calf cow calves was evaluated. Forty-four first-calf Friesian calves were used. Of these, 21 calves were assigned to the control group: colostrum intake by natural suckling from the mother during the first 24 hours of life, and 23 calves were assigned to the treatment group: 6 L bottle-fed colostrum of excellent immunological quality (>50 mg/ml Ig) during the first 12 hours of life. The calves were then artificially reared for 60 days under a traditional system. Total serum protein (TSP) levels were assessed on days 1, 4, and 8 of life, along with daily weight gain (DWG), the occurrence and severity of diarrhoea, and mortality rate. The treatment group achieved a higher TSP concentration (p<0.05) than the control group (6.28, 6.17, and 5.81 vs. 4.6; 4.6 and 4.6 g/d...