  We present lattice estimates of the mass of the heavy-light baryons
$\Lambda_b$ and $\Xi_b$ obtained using propagating heavy quarks. For
$\Lambda_b$ our result is $M_{\Lambda_b}=5.728 \pm 0.144 \pm 0.018$ GeV, after
extrapolation to the continuum limit and in the quenched approximation.
