AOAC. 1990. Official Methods of Analysis. Association of Official Analytical Chemists Virginia, USA.
Corrier, D. E. and J. R. DeLoach. 1990. Evaluation of cell mediated cutaneous basophil hypersensitivity in young chickens by an inter digital skin test. Poult. Sci. 69:403-408.
Danner, E. E. and W. Bessei. 2002. Effectiveness of liquid DL-methionine hydroxy analogue-free acid (DL-MHA-FA) compared to DL-methionine on performance of laying hens. Archives Gefluegel. 66:97-101.
Dibner, J. J. 2003. A review of the metabolism of 2-hydroxy-4-(methylthio) butanoic acid. World's Poult. Sci. J. 59:99-110.
Duncan, D. B. 1995 Multiple range and multiple F tests. Biometr. 11:1-42.
Han, Y., F. Castanon, C. M. Parsons and D. M. Baker. 1990. Absorption and bioavailability of DL-methionine hydroxy analog compared to DL-methionine. Poult. Sci. 69:281-287.
Harms, R. H. and G. B. Russell. 1994. A comparison of the bioavailability of dl-methionine and methionine hydroxyl analogue acid for the commercial laying hen. J. Appl. Poult. Res. 3:1-6.
Kidd, M. T. 2004. Nutritional modulation of immune function in broilers. Poult. Sci. 86:650-657.
Knight, C. D. and J. J. Dibner. 1986. Comparative absorption of 2-hydroxy-4-(methylthio) butanoic acid and L-methionine in the broiler chick. J. Nutr. 114:2179-2186.
Latshaw, J. D. 1991. Nutrition-Mechansim of immunosupression. Vet. Immunol. Immunopathol. 30:111-120.
Liu, Z., M. M. Bryant and D. A. Roland. 2004a. Bioavailability estimation of DL-Methionine hydroxy analogue relative to DL-methionine in layers fed Milo-soybean diets using different regression models. J. Appl. Poult. Res. 13:461-467.
Liu, Z., A. Bateman, M. Bryant, A. Abebe and D. Ronald. 2004b. Estimation of bioavailability of DL-methionine hydroxy analogue relative to DL-methionine in layers with exponential and slop-ratio models. Poult. Sci. 83:1580-1586.
Liu, Z., A. Bateman, M. Bryant, B. Zinner and D. Ronald. 2005. Performance comparisons between DL-methionine and DL-methionine hydroxyl analogue in layers on an unequal molar basis. J. Appl. Poult. Res. 14:569-575.
Lohakare, J. D., J. Y. Choi, J. K. Kim, J. S. Yons, Y. J. Shim, T. W. Hahn and B. J. Chae. 2005. Effects of dietary combination of vitamin A, E and methionine in growth performance, meat quality and immunity in commercial broilers. Asian-Aust. J. Anim. Sci. 18:516-523.
Mandal, A. B., A. V. Elangovan and T. S. Johri. 2004. Comparing Bio-efficacy of Liquid DL-methionine Hydroxy Analogue Free acid with DL-methionine in Broiler Chickens. Asian-Aust. J Anim. Sci. 17:102-108.
NRC. 1994. Nutrient requirements of Poultry. 9th Revised Edition, National Research Council, USA.
Panda, A. K., S. V. Rama Rao, M. V. L. N. Raju, G. Shyam Sunder and S. R. Sharma. 2005. Performance of commercial layers fed diets with various levels of methionine. Indian J. Anim. Nutr. 22(4):229-232.
Rama Rao, S. V., N. K. Praharaj, M. R. Reddy and A. K. Panda. 2003. G$\times$
E interaction between genotype and dietary levels of methionine for immune function in commercial broilers. Br. Poult. Sci. 44:104-112.
Rama Rao, S. V., M. V. L. N. Raju, A. K. Panda and M. R. Reddy. 2006. Sunflower meal as a substitute for soybean meal in commercial broiler chicken diets. Br. Poult. Sci. (in press).
Richards, J. D., C. A. Atwell, M. Vaquez-Anon and J. J. Dibner. 2005. Comparative in vitro and in vivo absorption of 2-hydroxy-4methylthio butanoic acid and methionine in the broiler chicken. Poult. Sci. 84:1397-1405.
Scott, M. L., M. C. Nesheim and R. J. Young. 1982. Nutrition of the Chicken. 3rd edn. Ithaca, New York
Snedecor, G. W. and W. G. Cochran. 1989. Statistical Methods. Oxford and IBH Publishing Company, New Delhi.
Swain, B. K. and T. S. Johri. 2000. Effect of supplemental methionine, choline and their combinations on the performance and immune response of broilers. Br. Poult. Sci. 41:83-88.
Tasaigbe, V. K., M. E. Cook, A. E. Harper and M. L. Sunde. 1987. Enhanced immune responses in broiler chicks fed methionine-supplemented diets. Poult. Sci. 66:1147-1154.
Vazquez-Anon, M., D. Kratzer, R. Gonzalez-Esquerra, I. G. Yi and C. D. Kinght. 2006. A multiple regression model approach to contrast the performance of 2-Hydroxy-4-Methylthio butanoic acid and DL-Methionine supplementation tested in broiler experiments and reported in the literature. Poult. Sci. 85:693-705.
Wegmann, T. G. and O. Smithies. 1966. A simple hemagglutination system requiring small amounts of red cells and antibodies. Transfusion. 6:67-73.