An efficient processing technique and suitable urea molasses block (UMB) composition for the application of the technique were developed at the Malaysian Agricultural Research and Development Institute (MARDI) for semi-commercial UMB production. The technique consists of grinding and mixing solid components, mixing the solid components with molasses and moulding. The UMB formulae suitable the application of the technique contained more than 50% of molasses, less than 25% of filler, less than 10% of binder and more than 10% of salt in total weight. The UMB processed by the technique led to a better performance of growing lambs than commercial UMB under the current experimental conditions.