Milk protein genes and growth hormone gene have been targeted as modulator genes in growth and carcass traits. With the objectives to detect some correlation or genotypic effect of three known functional genes on economic performance, 19 sires and their 139 progenies of Hanwoo population were genotyped for κ-casein, β-lactoglobulin and growth hormone(GH) loci by polymerase chain reaction(PCR)-restriction fragment length polymorphism(RFLP) analysis. The growth traits, such as Body Weight and Average Daily Gain, and carcass traits of this population were analysed for possible association with three genetic loci. The frequency of B allele for κ-casein was 0.37 in Hanwoo and 0.23 for β-lactoglobulin. Among the analysed loci, κ-casein gene was found most significantly associated with the growth traits of economic importance. However, the ,β-lactoglobulin and GH did not show significant effects in Hanwoo. For carcass traits, effects of κ-casein were significant in EMA. Therefore, genotyping the candidate animals for κ-casein in Hanwoo can be of great benefit in selection programs.