The objective of this study was to adapt the Gompertz function to growth data of chickens to testing the effects of oxygen-enriched drinking water on growth performance of Ross 308 broilers. Daily body weight change of chickens was determined from seven days of age to 49 days of age. Two treatment groups were included: control (5.50 mg/l dissolved oxygen), treatment (13.85 mg/l dissolved oxygen). The effect of oxygen-enriched drinking water on growth performance of chickens was determined by repeated measures analysis of variance. Gompertz growth function was applied to estimate growth parameters such as mature weight, growth rate and the age (days) at maximum daily weight gain of males and females for each group.