A factorial experiment was carried out to investigate the effect of two nutrition densities and three zeolite levels ( 0, 1.5 and 3.0 percent) on body weight gain, feed efficiency, nutrient utilization, mineral balance, serum characteristics and feed cost of broilers. The day-old Hubbard chicks were$quot; allocated to tripilcate of six treatments. The body weight gain of chicks was not influenced by zeolite level in diets of high nutrition density. However, an increasing body weight performance was recognized when increasing levels of zeolite were supplemented to the diets of low nutrition density, even though no significant difference was found among these treatments. Feed efficiency was improved by the addition of 1.5% zeolite to the ration with high nutrition density. However, similar efficiencies were recorded for chicks fed diets containing different zeolite levels and low nutrition density. The utilization efficiencies of proximate nutrients were highest for chicks receiving no zeolite. Similarly the utilization efficiencies of calcium, phosphorus, potassium and sodium were highest with diets containing no zeolite, whereas for magnesium, manganese and zinc the efficiency of utilization was highest for diets containing zeolite. The calcium contents of serum taken from chicks fed no zeolite were higher than those of treatments containing zeolite. There was no significant difference among phosphorus content of serum from any treatment. The level of alkaline phosphatase in serum from high nutrition density diets was higher than chicks fed low nutrition density diets, while in serum from chicks fed increasing levels of zeolite these levels increased in high nutrition density group, but not significantly. The reverse trend was recognized in low nutrition density treatment, also not significantly. The mean feed cost per Kg body weight gain of chicks fed ration with I.5% zeolite was lowest for treatments from high nutrition density diets and that with 3.0% zeolite was lowest in chicks fed low nutrition density diets. The high nutrition density diet cost more per unit gain of body weight than the low nutrition density diets.