Currently, Thai consumers prefer meat from Thai native chickens more and more because they have good meat texture led to a good taste and low cholesterol content compared to commercial broilers (Wattanachant et al., 2004; Jaturasitha et al., 2008). However, one of limitation of Thai native chicken is low growth rate and low number of egg production. From this reason, animal breeders need to improve these traits via the selection and mating plan. In theory, the number of parents in based population (G0) related with an effective population size (Ne) (Falconer and Mackay, 1996). The objective of this study was to compare genetic response of growth and egg production traits in Thai native chicken using index selection based on the difference number of sires and dams and selected short term (5 generations) and long term (10 generations)