Statistical Analysis
Nonlinear regressions were conducted with the
NLMIXED procedure of SAS (version 9.2; SAS Inst.
Inc., Cary, NC). Regression analysis was conducted
using the REG procedure of SAS. Pearson correlation
coefficients were calculated using the CORR procedure
of SAS. Residuals were analyzed as a 1-way
ANOVA, with dietary energy as the main effect using
the MIXED procedure of SAS. Pairwise differences
between means were determined with the PDIFF option
of the LSMEANS statement. All statements of
significance were reported at P ≤ 0.05.