  The mean electromotive force in the framework of mean--field
magnetohydrodynamics is found with a particular attention to the effect of a
mean rotation of the fluid on the mean electromotive force. Anisotropy of the
turbulence due to gradients of its intensity or its helicity are admitted. The
mean magnetic field is considered to be weak enough to exclude quenching
effects. Magnetic fluctuations with a zero mean magnetic field are taken into
account. The Omega x J -effect works in the same way with velocity fluctuations
and magnetic fluctuations. A contribution to the electromotive force connected
with the symmetric parts of the gradient tensor of the mean magnetic field was
found in the case of rotation, resulting from velocity or magnetic
fluctuations. The implications of the results for the mean electromotive force
for mean--field dynamo models are discussed with special emphasis to dynamos
working without alpha-effect.
