Adams AW & Craig JV. 1985. Effect of crowding and cage shape on productivity and profitability of caged layers: A survey. PoultryScience, 64: 238-242. DOI: 10.3382/ps.0640238
Adams AW & Jackson ME. 1970. Effect of cage size and bird density on performance of six commercial strains of layers. Poultry Science, 49: 1712-1719. DOI: 10.3382/ps.0491712
Anderson K, Havenstein G & Brake J. 1995. Effects of strain and rearing dietary regimens on brown-egg pullet growth and strain, rearing dietary regimens, density, and feeder space effects on subsequent laying performance. Poultry Science, 74: 1079-1092. DOI:10.3382/ps.0741079
Anderson KE. 1996. Final Report of the 31st North Carolina Layer Performance and Management Test: Production Report. Vol. 31, No. 4. May 1996.https://www.ces.ncsu.edu/depts/poulsci/tech_manuals/layer_reports/31_final_report.pdf
Anderson KE. 1998. Final Report of the Thirty Second North Carolina Layer performance and Management Test: Production Report. Vol. 32, No. 4. July 1998.https://www.ces.ncsu.edu/depts/poulsci/tech_manuals/layer_reports/32_final_report.pdf
Anderson KE. 2000. Final Report of the Thirty Third North Carolina Layer performance and Management Test: Production Report. Vol. 33, No. 4. October 2000.https://www.ces.ncsu.edu/depts/poulsci/tech_manuals/layer_reports/33_final_report.pdf
Anderson KE. 2002. Final Report Of The Thirty Fourth North Carolina Layer Performance And Management Test: Production Report. Vol. 34, No. 4. November 2002.https://www.ces.ncsu.edu/depts/poulsci/t
Anderson K & Havenstein G. 2007. Effects of alternative molting programs and population on layer performance: Results of the thirty-fifth North Carolina layer performance and management test. The Journal of Applied Poultry Research,16: 365-380. DOI:10.1093/japr/16.3.365
Anderson KE & Jenkins PK.2011. Effect of rearing dietary regimen, feeder space and density on egg production, quality and size distribution in two strains of brown egg layers. Intenational Journal of Poultry Science, 10:169-175. DOI:10.3923/ijps.2011.169.175
Borenstein M, Hedges L, Higgins J & Rothstein H. 2015. Comprehensive meta-analysis version 3. Englewood, NJ: Biostat, 104.
Cook RN. 2004. Effects of cage stocking density on feeding behaviors of group-housed laying hens. Proceedings of the 2004 ASAE Annual Meeting, American Society of Agricultural and Biological Engineers.
Cunningham DL. 1982. Cage type and density effects on performance and economic factors of caged layers. Poultry Science, 61: 1944-1949. DOI: 10.3382/ps.0611944
Cunningham DL & Ostrander CE. 1981. An evaluation of layer performance in deep and shallow cages at different densities. Poultry Science,60: 2010-2016. DOI: 10.3382/ps.0602010D
Dorminey R & Arscott G. 1971. Effects of bird density, nutrient density and perches on the performance of caged White Leghorn layers. Poultry Science, 50: 619-626. DOI:10.3382/ps.0500619
Faridi A, Gitoee A & France J. 2015. A meta-analysis of the effects of nonphytate phosphorus on broiler performance and tibia ash concentration. Poultry Science, 94: 2753-2762. DOI: 10.3382/ps/pev280
Hedges LV & Olkin I. 2014. Statistical methods for meta-analysis: Academic press. 369 Pages.
Hester PY & Wilson EK. 1986. Performance of White Leghorn hens in response to cage density and the introduction of cage mates. Poultry Science, 65:2029-2033. DOI: 10.3382/ps.0652029
Hill A & Hunt J. 1978. Layer cage depth effects on nervousness, feathering, shell breakage, performance, and net egg returns. Poultry Science, 57: 1204-1216. DOI: 10.3382/ps.0571204
Huedo-Medina TB, Sánchez-Meca J, Marín-Martínez F & Botella J. 2006. Assessing heterogeneity in meta-analysis: Q statistic or I² index?. Psychological Methods, 11: 193-206 DOI:10.1037/1082-989X.11.2.193
Jalal M, Scheideler S & Marx D. 2006. Effect of bird cage space and dietary metabolizable energy level on production parameters in laying hens. Poultry Science, 85: 306-311. DOI: 10.1093/ps/85.2.306
Keeling LJ, Estevez I, Newberry RC & Correia MG. 2003. Production-related traits of layers reared in different sized flocks: the concept of problematic intermediate group sizes. Poultry Science, 82: 1393-1396. DOI: 10.1093/ps/82.9.1393
Leeson S & Summers JD. 1984. Effects of cage density and diet energy concentration on the performance of growing Leghorn pullets subjected to early induced maturity. Poultry Science, 63: 875-882. DOI: 10.3382/ps.0630875
Mashaly MM, Webb ML, Youtz SL, Roush WB & Graves HB. 1984. Changes in serum corticosterone concentration of laying hens as a response to increased population density. Poultry Science, 63: 2271-2274. DOI: 10.3382/ps.0632271
Mench JA, Van Tienhoven A, Marsh JA, McCormick CC, Cunningham DL & Baker RC. 1986. Effects of cage and floor pen management on behavior, production, and physiological stress responses of laying hens. Poultry Science, 65: 1058-1069. DOI: 10.3382/ps.0651058
Ouart M & Adams A. 1982. Effects of cage design and bird density on layers.: 1. Productivity, feathering, and nervousness. Poultry Science, 61: 1606-1613. DOI:10.3382/ps.0611606
Patterson PH & Siegel HS. 1998. Impact of cage density on pullet performance and blood parameters of stress. Poultry Science, 77: 32-40. DOI: 10.1093/ps/77.1.32
Producers UE. 2006. Animal husbandry guidelines for US egg laying flocks. Alpharetta, GA: United Egg Producers.
Saki AA, Zamani P, RahmatiM & Mahmoudi H. 2012. The effect of cage density on laying hen performance, egg quality, and excreta minerals. Journal of Applied Poultry Reseacrh, 21: 467-475. DOI: 10.3382/japr.2010-00318