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We study the 1/N expansion of a generic, strongly correlated electron model(SU(N) symmetric Hubbard model with $U=\infty$ and N degrees of freedom perlattice site) in terms of X operators. The leading order of the expansiondescribes a usual Fermi liquid with renormalized, stable particles. Thenext-to-leading order violates Luttinger's theorem if a finite convergenceradius for the 1/N expansion for a fixed and non-vanishing doping away fromhalf-filling is assumed. We find that the volume enclosed by the Fermi surface,is at large, but finite N's and small dopings larger than at $N=\infty$. As aby-product an explicit expression for the electronic self-energy in O(1/N) isgiven which cannot be obtained by factorization or mode-coupling assumptionsbut contains rather sophisticated vertex corrections.Comment: revtex, 2 eps figues, to appear on Int. Journ. of Mod. Phys.

VIOLATION OF LUTTINGER'S THEOREM IN STRONGLY CORRELATED ELECTRONIC SYSTEMS WITHIN A 1/N EXPANSION