A total of 120-day-old broilers were divided into four groups. In group-A, broilers were left without supplementation of minerals and vitamins (control), while the broilers in groups B, C and D were given mineral and vitamin supplementation 1-6, 1-4 and 5-6 weeks, respectively. The results showed that the feed consumption of broilers in groups A, B, C and D was 4 234.61, 4 028.38, 4 169.32 and 4 181.87 g ? b-1; water intake was 9 668.88, 9 295.55, 9 882.11 and 9 402.86 L ? b-1; live body weight was 2 068.90, 2 360.90, 2 255.30 and 2 157.40 g ? b-1, respectively. The feed conversion ratio of broilers in groups A, B, C, D was 2.05, 1.71, 1.85 and 1.94 g ? b-1, carcass weight (wt) was 1 550, 1 656, 1 552 and 1 528.8 g ? b-1, and average dressing percentage was 61.24, 63.02, 62.60 and 60.51 respectively. Weight of heart in groups A, B, C and D was 15.13, 13.16, 11.72 and 11.50 g ? b-1, weight of gizzard was 32.98, 37.48, 37.62 and 33.35 g ? b-1, weight of liver was 51.94, 48.70, 51.94 and 48.70 g ? b-1and spleen weight was 3.48, 3.28, 3.06 and 2.82 g ? b-1, respectively. Average mortality of broilers in groups A, B, C and D was 6, 2, 4 and 5 resulting 20.00%, 8.00%, 13.00% and 16.00% mortality rate, respectively. The haemoglobin level in blood of broilers in groups A, B, C and D was 9.20, 12.23, 10.87 and 7.60 g ? dL-1, white blood cell level 77.47, 89.83, 81.63 and 78.13 (×106μL); red blood cell level 1.85, 2.58, 2.45 and 1.40 (×106μL), respectively. It was concluded that broilers given mineral and vitamin supplementation (Aquavit Electrolyte) for 6 weeks were proven to be most effective regime to result the lowest feed intake, the highest live body weight, better feed conversion ratio, higher carcass weight, better dressing percentage, higher net profit, relatively improved haemoglobin level in blood, increased counts of red blood cells and white blood cells. In all the above parameters, the broilers received mineral and vitamin supplementation for the first 4 weeks and the last 2 weeks showed relatively inferior performance, it is suggested that mineral and vitamin supplementation through water for partial period was not much effective in broiler productivity. Broilers may be supplemented with commercially available minerals and vitamins in drinking water over full rearing period, for achieving higher live body weight and efficient feed conversion ratio.