  We calculate symmetry-restoring counterterms in supersymmetric QCD at the
one-loop level. First we determine loop corrections to the supersymmetry and
gauge transformations and find counterterms in such a way that the symmetry
algebra holds at the one-loop level. Then these results are used to derive the
symmetry-restoring counterterms to all trilinear interactions. In order to
obtain unique results it is crucial to use the Slavnov-Taylor identity, which
does not only contain supersymmetric and gauge Ward identities but also
describes the symmetry algebra. In dimensional regularization this procedure
yields unique non-zero values for the counterterms. In contrast, in dimensional
reduction we find that no non-symmetric counterterms are needed, neither for
the symmetry transformations nor for the physical interactions. For the
considered cases this result constitutes a definite test of the supersymmetry
and gauge invariance of the scheme.
