EN
Blood acid-base, PCY and haemoglobin values and serum total protein, urea, glucose and electrolyte concentrations were determined in 51 clinically normal calves of 1-3, 4-7 and 8-10 days of age. The mean venous pH, НСОз and BE values were 7.363±0.038, 26.14±2.30 mmol/I and 0.35±2.01 mmol/l respectively between 1 and 3 days, and increased significantly to 7.386+0.036,27.46±2.80 mmol/l and 1.86+2.50 mmol/l between 4 and 10 days. The рСОз pressure did not change significantly due to age and for 1-10 day - old calves was 6.19+0.59 kPa. There were significant decreases in PCV and Hb values, from 0.32+0.05 1/1 and 102.4±11.3 g/1 to 0.29±0.04 1/1 and 97.3±15.1 g/1 respectively, between 1-3 and 4-10 days of age. The serum urea level declined from 3.12+0.79 mmol/l to 2.82±0.77 mmol/l, whereas serum inorganic phosphorus concentration elevated with increasing age from 2.26±0.33 mmol/l to 2.68±0.33 mmol/l. Serum total protein, glucose, sodium, potassium and chloride levels did not differ significantly during the first 10 days of life, and the mean values of these parameters were 56.7±10.0 g/1, 6.85±1.19 mmol/l, 133.10±9.78 mmol/l, 5.17±0.45 mmol/l and 99.43±2.63 mmol/l, respectively.