The linear regression analysiswas conducted on the 145 sample carcasses, using back fat thickness (X1) and muscle thickness (X2) determined with the OGP equipment as predictors and the dissected lean meat percentage in the carcass as dependent variable (Y). Results show that both independent observations, back fat thickness and muscle
thickness, were statistically significant predictors of the lean meat percentage in the pig carcass (for back fat thickness:
t = −16.929, P b 0.001 and for muscle thickness: t = 6.629, P b 0.001). They explain a significant amount of variance in the value of lean meat percentage (F(2142) = 274.084, P b 0.05, R2 = 0.794, R2
Adjusted = 0.791). The RMSEP was computed by applying the leave-one-out full cross-validation technique, on all 145 carcasses. The RMSEP