In a recent review, Hoque and Suzuki (2009) summarized models for calculation of RFI for beef cattle and recommended the equation RFIphe = DFI – (β1× ADG + β2 × MWT) in which RFIphe = phenotypic RFI, DFI = daily feed intake, MWT =metabolic BW at mid test, and β1 and β2= partial regression coefficients of the DFI of an animal on MWT and DG, respectively.