Abbasi M.A., Mahdavi A.H., Samie A.H. and Jahanian R. (2014). Effects of different levels of dietary crude protein and threonine on performance, humoral immune responses and intestinal morphology of broiler chicks. Brazilian Journal of Poultry Science. 16: 35-44.
Ahmed Mohamed E. and Abbas T. (2011). Effects of Dietary Levels of Methionine on Broiler Performance and Carcass Characteristics. International Journal of Poultry Science 10 (2): 147-151.
Attia A.I., Mahrose K.M., Ismail I.E. and Abou-Kasem D.E. (2012). Response of growing Japanese quail raised under two stocking densities to dietary protein and energy levels. Egyptian Journal of Animal Production, 47: 159-166.
Babu M, Sundarasu V. and Kothandaraman M. (1986). Studies in energy and protein requirements of broiler chicken. Indian Journal of Poultry Science, 26: 275-279.
Baiao N.C., Ferreira M.O. , Borges F.MO. and Monti M. (1999). Effect of methionine on performance of laying hens. Medicine veterinary zoo technology.51:271-274.
Buwjoom T., Yamauchi K., Erikawa Tand Goto H. (2010). Histological intestinal alterations in chickens fed low-protein diet. Journal of Animal Physiology and Animal Nutrition. 94: 354–361.
Chen N.S., Ma J.Z., Zhou H.Y., Zhou J., Qiu X.J., Jin L.N. and Lin L.F. (2010). Assessment of Dietary Methionine Requirement in Largemouth Bass, Micropterus Salmoides. Journal Fisheries China , 34, 1244-1253.
Djouvin D. and Mihailov R. (2005). Effect of low protein level on performance of growing and laying Japanese quail (coturnix coturnix japonica). Bulgarian Journal of Veterinary Medicine. 8: 91-98.
Fangyan D., Higginbotham A. and White D. (2000). Food intake, energy balance and serum leptin concentrations in rats fed low–protein diets. Journal of Nutrition, 130: 514-521.
Hernandez, F., Madrid, J., Garcia, V., Orengo, J. and Megias, M. D. (2012). Influence of two plant extracts on broiler performance, digestibility, and digestive organ size. Poultry Science, 83: 169-174.
Kamran Z., Sarwar M., Nisa M.U., Nadeem M.A. and Mahmood S. (2010). Effect of low levels of dietary crude protein with constant metabolizable energy on nitrogen excretion, litter composition and blood parameters of broilers, International Journal of Agriculture and Biology, 12: 401–405.
Kaur S, Mandal A. B., Singh K.B. and Kadam M.M. (2007). The response of Japanese quail (heavy body weight line) to dietary energy levels and graded essential amino acids levels on growth performance and immuno-competence. Livestock science. 117:255-262.
Kirkpinar F. and ˙I. Oguz (1995). Influence of various dietary protein levels on carcass composition in the male Japanese quail (Coturnix coturnix japonica). British Poultry Science. 36:605–610.
Laudadio V., Passantino L., Perillo A., Lopresti G., Passantino A., Khan R.U. and Tufarelli V. (2012). Productive performance and histological features of intestinal mucosa of broiler chickens fed different dietary protein levels. Poultry Science. 91: 265–270.
Moral E. T. and Stillborn M. (1996). Effect of Glutamic acid on broiler given submarginal crude protein with adequate essential amino acids using feeds high and low in potassium. Poultry Science, 75: 120-129.
Namroud N., Shivazad M. and Zaghari M. (2008). Effects of fortifying low crude protein diet with crystalline amino acids on performance, blood ammonia level, and excreta characteristics of broiler chicks. Poultry Science. 87:2250–2258.
National Research Council (1994). Nutrient Requirements of Poultry. 9th rev. Ed., Washington, DC., USA.
Ojano-Dirain, C.P. and Waldroup P.W., )2002(. Evaluation of lysine, methionine and threonine needs of broilers three to six week of age under moderate temperature stress. International Journal of Poultry Science, 1: 16-21.
Oliveira E.G., Almeida M.IM., Mendes A.A., Veiga N., Roça R.O. and Dias K. (2005). Evaluation of carcass yield of meat from quails fed diets with different protein levels. Archives of Veterinary Science 10: 42-45.
Ospina-Rojas I., Murakami A., Duarte C., Eyng C., Oliveira C., and Janeiro V. (2014). Valine, isoleucine, arginine and glycine supplementation of low-protein diets for broiler chickens during the starter and grower phases. British Poultry Science, 55:766–773.
Parvin R., Asit B M., Satyendra M S., and Rakesh T. (2009). Effect of dietary level of methionine on growth performance and immune responsein Japanese quails (Coturnix coturnix japonica). Journal of Science and Food Agriculture; 90: 471–481.
Rahman M.S., Pramanik A.H. and Basak B. (2002). Effect of feeding low protein diets on the performance of broiler during hot–humid season. Journal of Poultry Science, 1: 35-39.
Rezaei M., Nassirimoghaddam H., Pourreza J. and Kermanshahi H. (2004). The effect of dietary protein and lysine levels on broiler performance, carcass characteristics and nitrogen excretion. Journal of Poultry Science, 3(2): 148-152.
Sakamoto, K., Hirose H., Onizuka A., Hayashi M., Futamura N., Kawamura Y., et al.( 2000). Quantitative study of changes in intestinal morphology and mucus gel on total parenteral nutrition in rats. Journal of Surgery Research 94:99–106.
SAS. )2006(. Statistical Analysis Systems, Version 9.4. Cary, NC: SAS Institue Inc.
Shayan, B.S., N. Eila and H. Norozian,)2013(. The effect of decreased crude protein diets on performance, immune response and carcass traits of Japanese quail chickens. Annalls of Bioogicall Reseasrch, 4: 313-317.
Tufarelli V., Desantis S., Zizza S. and Laudadio V. (2010). Performance, gut morphology, and carcass characteristics of fattening rabbits as affected by particle size of pelleted diets. Archives of Animal Nutrition. 64: 373–382.
Zui K., Nitson S. and Cahanen A. (1992). Effects of different dietary levels of protein on fat deposition in broiler divergently selected for high or low abdominal; adipose tissue. British Poultry Science. 33: 517-524.
)