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We perform a lattice computation of the flavour octet contribution to theaverage quark momentum in a nucleon, $\la x\ra^{(8)}_{\mu^2 = 4 \gev^2}$. Inparticular, we fully take the disconnected contributions into account in ouranalysis for which we use a generalization of the technique developed in\cite{Dinter:2012tt}. We investigate systematic effects with a particularemphasis on the excited states contamination. We find that in therenormalization free ratio $\frac{\la x \ra^{(3)}}{\la x \ra^{(8)}}$ (with $\lax \ra^{(3)}$ the non-singlet moment) the excited state contributions cancel toa large extend making this ratio a promising candidate for a comparison tophenomenological analyses. Our final result for this ratio is in agreement withthe phenomenological value and we find, including systematic errors, $\frac{\lax \ra^{(3)}}{\la x \ra^{(8)}} = 0.39(1)(4)$.

First moment of the flavour octet nucleon parton distribution function using lattice QCD