The objective of this study was to determine the growth performances and carcass characteristics of male veal calves fed at different levels of acidified whole milk and milk replacer. Twenty-four male Holstein- Friesian 75% crossbred calves with an initial average live weight of 35.44±1.73 kg were allotted into 4 groups under a completely randomized design (CRD) for 90 days. Group 1 received 100% whole acidified milk (AM), group 2 received 75% AM and 25% milk replacer (MR), group 3 received 50% AM and 50% MR and group 4 received 100% MR. All groups received 10% body weight of liquid diet, 2% live weight of starter feed and ad libitum of rice straw. After 90 days, the calves in group 1 showed the best final live weight (98.33 kg) followed by groups 2 (75.08 kg), 3 (70.00 kg) and 4 (57.36 kg) (P<0.01). The average daily gains of the calves in groups 1, 2, 3 and 4 were 648.51, 467.59, 387.22 and 256.11 g / d, respectively (P<0.01). The FCR of calves in groups 1 to 4 were 2.49, 2.86, 3.46 and 4.19, respectively (P<0.01). There were no health problems in any of the groups during the experimental study. Calves in group 1 exhibited firm dry faeces with a brown colour, group 2 showed creamy faeces, light brown, and both 3 and 4 showed wet faeces with a brown colour. The calves in group 1 had a similar chilled carcass percentage (53.65%) to calves in groups 2 (52.99%) and 3 (50.28%), but significantly (P<0.05) higher than calves in group 4 (47.19%). The calves in group 1 had the highest loin eye area (25.66 cm2) followed by the calves in groups 2 (22.67 cm2), 3 (16.33 cm2) and 4 (11.33 cm2) (P<0.05). Meat colour was redder but brighter for group 1 and 2 calves compared with groups 3 and 4. There were no significant differences (P>0.05) in the percentage of fore-quarter and hind-quarter between the treatments. Considering production costs, calves in group 1 showed the lowest cost per live weight gain (53.31 baht/kg gain), followed by group 2 (64.39 baht/kg gain), 3 (77.74 baht/kg gain) and 4 (116.82 baht/kg gain), respectively.