Digestibility and voluntary intake trials were undertaken with S.A. Mutton Merino wethers fed a basal diet of milled lucerne and oat hay (control diet) to which various proportions of milled Prosopis juliflora pods were added up to 100% replacement. Ad lib.intakes of pure Prosopis pods did not differ significantly from the control diet, but at high levels of pod inclusion, digestibilities were reduced, especially that of crude fibre. In this study it was concluded that the digestibilities of pod constituents appeared to maximize at 40% pod inclusion