  We make a perturbative calculation of neutrino scattering and absorption in
hot and dense hyperonic neutron-star matter in the presence of a strong
magnetic Field. We calculate that the absorption cross-sections in a fully
relativistic mean-field theory. We find that there is a remarkable angular
dependence, i.e. the neutrino absorption strength is reduced in a direction
parallel to the magnetic Field and enhanced in the opposite direction. This
asymmetry in the neutrino absorption is estimated to be as much as 2.2 % of the
entire neutrino momentum for an interior magnetic Field of 2 x 10^{17} G. The
pulsar kick velocities associated with this asymmetry are shown to be
comparable to observed velocities.
