1. Yen, J.T. Digestion and Absorption of Nutrients. EAS, 2005.

2. Reece, W.O. Physiology of Domestic Animals, 2nd Ed.; Lippincott Williams & Wilkins: Philadelphia, PA, 1997.

3. Swenson, M.J.; Reece, W.O. Dukes' Physiology of Domes tic Animals, 11th Ed.; Comstock Publishing Associates/ Cornell University Press: Ithaca, NY, 1993.

4. Cunningham, J.G. Textbook of Veterinary Physiology; W. B. Saunders Co.: Philadelphia, PA, 1992.

5. Stevens, C.E.; Hume, I.D. Comparative Physiology of the Vertebrate Digestive System, 2nd Ed.; Cambridge Univer sity Press: Cambridge, UK, 1996.

Jong-Tseng Yen

United States Department of Agriculture, Agricultural Research Service, Clay Center, Nebraska, U.S.A.

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