Association of Official Analytical Chemists. 1980. Official Methods of Analysis. 13th ed., Washington D. C.
Balnave, D. and A. Oliva. 1990. Responses of finishing broilers at high temperatures to dietary methionine source and supplementation levels. Aust. J. Agric. Res. 415:57-564.
Fernandez-Figares, I., C. Prieto, R. Nieto and J. F. Aguilera. 1997. Free amino acid concentrations in plasma, muscle and liver as indirect measures of protein adequacy in growing chickens. Anim. Sci. 64:529-539.
Geiger, R. 1984. Chymotrypsin. Method with N-succinyl-Lphenylalanine–4 -nitroanilide as substrate. In ： H. U. Bergmeyer (Ed.) Methods of Enzymatic Analysis (3rd Ed.), Vol. 5. p. 9918. Verlag Cheme, Weinheim.
Geiger, R. and H. Fritz. 1984. Trypsin. Method with N-Benzoyl-Larginine-4-nitroanilide as substrate. In: H. U. Bergmeyer (Ed.) Methods of Enzymatic Analysis (3rd Ed.), Vol. 5. p. 11929. Verlag Chemie, Weinheim.
Go, V. L. W., A. F. Hoffman and W. H. J. Summerskill. 1970. Pancreozymin bioassay in man based on pancreatic enzyme secretion: potency of specific amino acids and other digestive products. J. Clin. Invest. 49:1558-1564.
Grossman, M. I., H. Greengard and A. C. Ivy. 1943. The effect of dietary composition on pancreatic enzymes. Am. J. Physiol. 138:676-682.
Josefsson, L. and T. Lindberg. 1965. Intestinal dipeptidases, 1. Spectrophotometric determination and characterization of dipeptidase activity in pig intestinal mucosa. Biochim. Biophy. Acta. 149-166.
Konturek, S. J., J. Tasler, M. Cieszkowski, J. Jaworek and J. Konturek. 1979. Intravenous amino acids and fat stimulate pancreatic secretion. Am. J. Physiol. 236(6):E678-E684.
Lien, T. F. and D. F. Jan. 1999. The effect on the lipid metabolism of Tsaiya ducks when high levels of choline or methionine are added to the duck's diet. Asian-Aust. J. Anim. Sci. 12: 1090-1095.
Lowry, O. H., N. J. Rosebrough, A. L. Farr and R. J. Randall. 1951. Protein measurement with the Folin-phenol reagent. J. Biol. Chem. 193:265-275.
Lu, J. J. 1999. Development of protein digestive enzymes and effects of nutrient treatment on their activities in broilers and mule ducks. Ph. D. Thesis, National Taiwan University, Taipei, Taiwan, Republic of China.
Lu, J. J. and F. J. Lai. 2001. The effects of DL-methionine and DLmethionine hydroxy analogue on growth performance and protein digestive enzymes activities in Pekin ducks. J. Chin. Soci. Ani. Sci. 30(3):143-153.
Meyer, J. H. and M. I. Grossman. 1972. Comparison of D- and Lphenylalanine as pancreatic stimulants. Am. J. Physiol. 222:1058-1063.
National Research Council. 1994. Nutrient Requirements of Poultry. 9th revised edition, National Academy Press, Washington. D. C.
Poort, S. R. and C. Poort. 1981. Effect of feeding diets of different composition on the protein synthetic pattern of the rat pancreas. J. Nutr. 111:1475-1479.
Rick, W. and W. Fritsch. 1974. Pepsin. Measurement with haemoglobin as a substrate. In: H. U. Bergmeyer (Ed.) Methods of Enzymatic Analysis (2nd Ed.) Vol. 2. Academic Press, Inc., New York. p. 1046052.
Rostagno, H. S. and W. A. Barbosa. 1995. Biological efficacy and absorption of DL-methionine hydroxy analogue free acid compared to DL-methionine in chickens as affected by heat strees. Br. Poult. Sci. 36:303-312.
SAS Institute. 1985. SAS User's Guide. Statistics. Version 5 Edition. SAS Institute Inc., Cary, NC.
Schneeman, B. O., I. Chang, L. B. Smith and R. L. Lyman. 1977. Effect of dietary amino acids, casein and soybean trypsin inhibitor on pancreatic protein secretion in rats. J. Nutr. 107:281-288.
Steel, R. G. D. and J. H. Torrie. 1980. Principles and Procedures of Statistics. 2nd ed. McGraw-Hill Book Co., Inc., New York.
Thomas, O. P., C. Tamplin, S. D. Crissey, E. Bossard and A. Zuckerman. 1991. An evaluation of methionine hydroxy analog free acid using a nonlinear (exponential) bioassay. Poult. Sci. 70:605-610.
Waldroup, P. W., C. J. Mabray, J. R. Blackman, P. J. Slagter, R. J. Short and Z. B. Johnson. 1981. Effectiveness of the free acid of methionine hydroxy analogue as a methionine supplement in broiler diets. Poult. Sci. 60:438-443.
Yanming, H., F. Castanon, C. M. Parsons and D. H. Baker. 1990. Absorption and bioavailability of DL-methionine hydroxy analog compared to DL-methionine. Poult. Sci. 69:281-287.
Yang, S. I., T. Muramatsu, I. Tasaki and J. I. Okumura. 1989a. Responses of the pancreatic digestive enzyme secretion to amino acid, glucose and cholecystokinin in chicks. Comp. Biochem. Physiol. 92A(3):313-317.
Yang, S. I., M. Furuse, T. Muramatsu and J. I. Okumura. 1989b. Enhanced release of cholecystokinin by dietary amino acid in chicks. Comp. Biochem. Physiol. 92A(3):319-322.
Yang, S. I., M. Furuse, T. Muramatsu and J. I. Okumura, 1989c. Responses of the pancreatic digestive enzyme secretion to various combinations of amino acids and cholecystokinin in chicks (Gallus Domesticus). Comp. Biochem. Physiol. 93A(4):703-706.
Zimmerman, R. A. and H. M. scott. 1965. Interrelationship of plasma amino acid levels and weight gain in the chick as influenced by suboptimal and superoptimal dietary concentration of single amino acids. J. Nutr. 87:13-18.