Normal modes of vibration of nuclei in fcc nonmonovalent transition-element nickel have usually been investigated by lattice-dynamical approaches in which the Cauchy discrepancy (${C}_{12}\ensuremath{-}{C}_{44}$) has been attributed to the bulk modulus of the conduction electrons (i.e., ${C}_{12}\ensuremath{-}{C}_{44}={K}_{e}$). The authors consider here an approach in which it is assumed that there are also noncentral-force contributions that combine with the electron gas to break the Cauchy relations of elasticity. For this purpose, the angular interactions are taken from the Clark, Gazis, and Wallis approach and volume forces have been taken from the Krebs scheme, using an appropriate value of the screening parameter taken from the Bohm-Pines plasma theory which takes into account the electron correlations. The frequency versus wave-vector dispersion relations along symmetry directions [$\ensuremath{\zeta}00$], [$\ensuremath{\zeta}\ensuremath{\zeta}0$], and [$\ensuremath{\zeta}\ensuremath{\zeta}\ensuremath{\zeta}$] in the reciprocal space of Ni are computed from the solutions of the secular equation along these directions. The frequency distribution has been calculated with the Blackman's root-sampling technique for a discrete subdivision in wave-vector space. Below $\frac{\ensuremath{\Theta}}{10}$, where the sampling technique gives an inadequate description of the normal modes of vibrations, a modified Houston's spherical six-term integration procedure is employed. Results obtained with the above combination of various interactions are discussed in the light of previous calculations, and the present values are found to yield comparatively better agreement with experiments.