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Acid insoluble ash, chromic oxide and ster and Gabbot 197 I), freshwater crayfish ytterbium acetate were evaluated as digestibility mark-Procambarus &rkii et 1986), and lobster Homarus sp. (Bordner et al. 1983; Van Keulen, J. and B. A. Young. 1977. Evaluation of acid insoluble ash as a natural marker in ruminant digestibility studies. Journal of Animal Science 44: 28 2-28 7, Vogtmann, H., H.P. Pfirter and A. L. Prabucki. 1975. A new method of determining metabolisability of energy and digestibility of fatty acids in broiler diets. British Poultry Science 1653 1-534.

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