The estimated variance–covariance (VCV) matrix from the full unconstrained phenotypic bivariate random regression model of tolerance [slope of body weight (WT) on strongyle FEC: WT∼FEC] and relLBS using MCMCglmm.

The estimated variances (diagonal, marked with asterisks*), covariances (below diagonal, marked with a superscript a), and correlations (above diagonal, marked with a superscript b) are shown with the upper and lower 95% HPD intervals in parentheses. The covariance or correlation between a pair of variables is judged to be significant where the 95% HPD intervals do not overlap zero, and these cases are shown in bold italics. “relLBS” refers to the fact that we divided absolute LBS by the sex-specific mean to obtain relative LBS in order to calculate standardized selection gradients.