Indian Journal of Poultry Science

This study was conductedon 1392 pullets of a layer strain with an objective to compare two different methods of estimation of relative selection efficinces (i.e. Searele, 1965-RSE I; Bohem et al., 1970-RSE II). Results of relative efficiency indicated that with the increase in part periods, relative efficiency increases and attains maximum value at 300 days by both methods. The comparison of relative selection efficiency by two methods showed that RSE II (based on part and residual) is better than RSE I (only part production) because it includes various residual periods. The genetic correlation between part and residual is positive and high in magnitude. Relative selection efficiency based on part period production indicated the selection on part egg production upto 280 days to 300 days is most efficient. So it is suggested that for improving annual egg production, selection should be based on egg number upto 280–300 days.