1. AOAC, 1995. Official Methods of Analysis of AOAC International. Vol. I. Agriculture Chemicals; Contaminants, Drugs. 16th edn. AOAC International, Arlington, VA.
2. Evaluation of acid-insoluble ash as an indicator of feed digestibility in rainbow trout (Salmo gairdneri);Atkinson;Can. J. Fish. Aquat. Sci.,1984
3. Effect of pressure and temperature on the availability of lysine in meat and bone meal as determined by slope-ratio assays with growing pigs, rats and chicks and by chemical techniques;Batterham;Br. J. Nutr.,1986
4. Bisplinghoff, F., 1996. North American perspective of rendering — 21st Century. In: Franco, D.A., Swanson, W. (Eds.), The Original Recyclers. The Animal Protein Industry, The Fats and Proteins Research Foundation and The National Renderers Association, Alexandria, pp. 239–259.
5. A rapid method of total lipid extraction and purification;Bligh;Can. J. Biochem. Physiol.,1959