Probability of Z → bb decay and anomalous properties of the t-quark

In the framework of the model of the dynamical breaking of the electroweak symmetry we consider the problem of possible disagreement of the probability of Z → bb decay with standard model calculations. The large anomalous magnetic moment of the t-quark, inherent to the model, leads to a weak magnetic term in the Wtb vertex. This term in the one loop approximation gives the contribution to the Z → bb amplitude, which leads to an increase of the probability. Estimates show that the model gives a consistent description of existing data. Ways to check the validity of the model are indicated.