Australian scientists used postweaning records on 1781 bulls and heifers individually tested for feed efficiency, and cow records taken at 4 yrs. of age on 751 of the same heifers to estimate genetic correlations between postweaning feed efficiency and certain cow traits. Postweaning feed efficiency traits measured were residual feed intake (RFI; actual feed intake minus expected intake) and feed conversion ratio (FCR; feed intake per unit of gain). Therefore, efficient animals would have lower values for both traits. Results indicated that when selection of young cattle for improved feed efficiency is based on FCR, weak correlated responses in reduced cow feed intake and in increased cow weight would be expected. However, when selection for improved efficiency is based on RFI, a strong correlated response in reduced cow feed intake is expected with no change in cow weight. These results suggest that selection for improved RFI is considerably stronger in its correlated effects on subsequent cow efficiency than is selection for FCR (Arthur et al. 2004. J. Anim. Sci. 82 [Suppl. 1]: 449).