  The paper formulates the Standard Model with massive fermions without
introduction of the Yukawa interaction of Higgs bosons with fermions. For
invariance to be preserved in the newly stated theory, the covariant derivative
should be generalized, as follows. With such approach, Higgs bosons are
responsible only for the gauge invariance of the boson sector of the theory and
interact only with gauge bosons, gluons and photons.
