1. Association of Official Agricultural Chemists (1975) Official Methods of Analysis 12th edn, (ed. W. Horwitz), Washington, DC, USA.
2. Aten, A., Innis, R.F. and Knew, E. (1955) Flaying and Curing of Hides and Skins as a Rural Industry. Food and Agricultural Organization of the United Nations, Rome.
3. Bidermann, K., Neck, H., Neher, M.B. and Wilhelmy, V., Jr (1962) A technical economic evaluation of four hide curing methods. Agricultural Economic Report, no. 16, Marketing Economics Division, Economic Research Service, USDA, Washington.
4. El Boushy, A.R., Dieleman, S.H., Koene, J.I.A. and van der Poel, A.F.B. (1991) Tannery waste by-product from cattle hides, its suitability as a feedstuff. Bioresource Technol., 35, 321–3.
5. FAO (1990) Production Yearbook, Vol. 42. Food and Agricultural Organization of the United Nations, Rome.