Statistical Analysis
Data were analyzed using the Mixed Model procedures of SAS (1999) for dependent performance, carcass, quality and sensory traits measured. Fixed effects included in the model were sex and RN genotype, with sire and litter included as random effects. Off-test date was included in all muscle quality and sensory measures. A linear covariate for live market weight was included in models for backfat and LMA. Growth rate was adjusted to a constant starting weight of 36 kg using guidelines recommended by the National Swine Improvement Federation (1997). Residual correlations among traits were estimated by using the MANOVA statement found in the GLM procedure of SAS with fixed effects of sex, RN genotype and off-test date and random effects of sire and litter.