  We investigate the well-known correlations between the dynamical
mass-to-light ratio M/L and other global observables of elliptical (E) and
lenticular (S0) galaxies. We construct two-integral Jeans and three-integral
Schwarzschild dynamical models for a sample of 25 E/S0 galaxies with SAURON
integral-field stellar kinematics to about one effective (half-light) radius
R_e. The comparison of the dynamical M/L with the (M/L)_pop inferred from the
analysis of the stellar population, indicates that dark matter in early-type
galaxies contributes ~30% of the total mass inside one R_e, in agreement with
previous studies, with significant variations from galaxy to galaxy. Our
results suggest a variation in M/L at constant (M/L)_pop, which seems to be
linked to the galaxy dynamics. We speculate that fast rotating galaxies have
lower dark matter fractions than the slow rotating and generally more massive
ones.
