This experiment was carried out to investigate the feeding effects of bleachable fancy tallow and to determine the proper supplementation level of tallow in broiler diets. Two trials involving lots (Control, Test 1, Test 2) of 120 male and female Nichols chicks with 2 replications fed 24% level of protein in each trial conducted for 8 weeks. Starters were given to chicks from 1 day of age to 4 weeks of age and finishers from 5 to 8 weeks of age. Tallow was supplemented to each experimental diets at the levels of 0, 4 and 8% in starter and 0, 5 and 10% in finisher replacing ground yellow corn and soybean oil meal. Calorie-protein ratios based on metabolizable energy were 57.9, 58.2 and 60.2 in starter and 60.9, 64.4 and 66.0 in finisher, respectively. No significant differences were observed in growth rate and feed intake. Feed conversion, however, was improved by 3.9 and 8.3% in female Test 1 and Test 2, respectively and by 4.9 and 6.3% in male Test 1 and Teat 2. The differences in feed conversion efficiency were significant only in male at the level of 5% but the difference between Test 1 and Test 2 and was not significant.