References

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Faria, D.E., R.H. Harms and G.B. Russell, 2002. Threonine requirement of commercial laying hens fed a corn-soybean meal diet. Poult. Sci., 81: 809-814.
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Ishibashi, T., Y. Ogawa, T. Itoh, S. Fujimura, K. Koide and R. Watanabe, 1998. Threonine requirements of laying hens. Poult. Sci., 77: 998-1002.
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Keshavarz, K. and M.E. Jackson, 1992. Performance of growing pullets and laying hens fed low protein amino acid supplemented diets. Poult. Sci., 71: 905-916.
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Martinez-Amezcua, C., J.L. Laparra-Vega, E. Avila-Gonzalez, B. Fuente and T. Jinez, 1999. Dietary l-threonine responses in laying hens. J. Applied Poult. Res., 8: 236-241.
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Parlat, S.S., A.O. Yildiz and O. Yazgan, 2003. Effects on performance traits of laying japanese quails of threonine supplementation to diets containing high protein. J. Anim. Res., 13: 9-12.

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Sohail, S.S., M.M. Bryant and D.A. Roland, 2002. Influence of supplemental lysine, isoleucine, threonine, tryptophan and total sulfur amino acids on egg weight of hy-line W-36 hens. Poult. Sci., 81: 1038-1044.
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Zollitsch, W., K. Jevne, K. Leske and C. Coon, 1993. Utilization of crystalline amino acids in laying hen diets. Proceeding of the 4th Fermex Amino Acid Council Meeting, September 24, 1993, Mexico City, Mexico, pp: 85-121.