  A collective vector-boson model with broken SU(3) symmetry is applied to
several deformed even-even nuclei. The model description of ground and $\gamma$
bands together with the corresponding B(E2) transition probabilities is
investigated within a broad range of SU(3) irreducible representations (irreps)
$(\lambda ,\mu )$. The SU(3)-symmetry characteristics of rotational nuclei are
analyzed in terms of the bandmixing interactions.
