Rethinking Stocking Density in Broilers: Assessments of Physiological, Behavioral, and Environmental Impacts

Year : 2026 | Volume : 16 | Issue : 02 | Page : 23 32
By

Md. Emran Hossain,

  1. Professor, Department of Animal Science and Nutrition, Chattogram Veterinary and Animal Sciences University, Khulshi, Chattogram-4225, Bangladesh

Abstract

High stocking density in broiler production is a common practice aimed at maximizing space utilization and economic returns. However, it poses significant challenges to the performance, health, and welfare of the birds. This study explores the multifaceted impacts of elevated stocking density on broiler chickens, highlighting the physiological, behavioral, and environmental factors that deteriorate their overall well-being. Increased stocking density is associated with reduced growth rates, poor feed conversion efficiency, compromised immune function, and heightened susceptibility to respiratory diseases. Additionally, overcrowding impairs welfare through limited mobility, increased incidence of leg disorders, feather pecking, and stress-related behaviors, while also exacerbating litter quality and ammonia buildup, further contributing to health risks. The study examines how these adverse effects cumulatively result in higher mortality rates and reduced productivity, underscoring the need for optimal stocking density management to ensure sustainable broiler production. The findings emphasize the importance of balancing economic considerations with animal welfare and health to promote both ethical and productive poultry farming practices.

Keywords: Broiler, health, performance, productivity, stocking density, welfare

[This article belongs to Research and Reviews : A Journal of Life Sciences ]

How to cite this article: Md. Emran Hossain. Rethinking Stocking Density in Broilers: Assessments of Physiological, Behavioral, and Environmental Impacts. Research and Reviews : A Journal of Life Sciences. 2026; 16(02):23-32.
How to cite this URL: Md. Emran Hossain. Rethinking Stocking Density in Broilers: Assessments of Physiological, Behavioral, and Environmental Impacts. Research and Reviews : A Journal of Life Sciences. 2026; 16(02):23-32. Available from: https://journals.stmjournals.com/rrjols/article=2026/view=244056

References

  1. Chung ELT, Bakar NAA, Fauzi NAA, Jesse FFA, Loh TC. How stocking density affects broiler chicken production? A comprehensive review. Poult Sci J. 2026. Accessed 2026 Mar 27. Available from: https://search.ebscohost.com/login.aspx?direct=true&profile=ehost&scope=site&authtype=
    crawler&jrnl=23456604&AN=191554848&h=YLM03iPVL2GUSWdlLCiFFXrKWIUZCXNQg3%2FhFCKsTTE6MlwpduY08CtGOaHVVX1OYy0Ndt1h%2BDEy40je5Ll%2BVA%3D%3D&crl=c
  2. Bai D, et al. Comprehensive analysis of the effects of high stocking density stress on broiler health. Front Vet Sci. 2026;12. doi: 3389/fvets.2025.1741407.
  3. N.-P. S. and Management and undefined. Improving bone health in broiler chickens: Integrating population density, housing, and nutritional strategies for enhanced welfare and productivity. Poult Sci Manag. 2025;2(1). doi: 10.1186/s44364-025-00017-y.
  4. Zhou S, et al. Evaluating broiler welfare and behavior as affected by growth rate and stocking density. Poult Sci. 2024;103(4). doi: 1016/j.psj.2024.103459.
  5. Tainika B, Şekeroğlu A, Akyol A, Waithaka Ng’ang’a Z. Effect of stocking density on broilers behaviour and welfare indices. Br Poult Sci. 2023;79(2):285–329. doi: 1080/00439339.2023.2175343.
  6. Shynkaruk T, Long K, LeBlanc C, Schwean-Lardner K. Impact of stocking density on the welfare and productivity of broiler chickens reared to 34 d of age. J Appl Poult Res. 2023;32(2). doi: 1016/j.japr.2023.100344.
  7. Nielsen SS, et al. Welfare of broilers on farm. EFSA J. 2023;21(2). doi: 2903/j.efsa.2023.7788.
  8. van der Eijk JAJ, Gunnink H, Melis S, van Riel JW, de Jong IC. Reducing stocking density benefits behaviour of fast- and slower-growing broilers. Appl Anim Behav Sci. 2022;257. doi: 1016/j.applanim.2022.105754.
  9. Thema KK, Mnisi CM, Mlambo V. Dietary strategies to alleviate high-stocking-density-induced stress in broiler chickens–a comprehensive review. PLoS One. 2022;17(10). doi: 1371/journal.pone.0275811.
  10. Son J, Kim HJ, Hong EC, Kang HK. Effects of stocking density on growth performance, antioxidant status, and meat quality of finisher broiler chickens under high temperature. Antioxidants (Basel). 2022;11(5). doi: 3390/antiox11050871.
  11. El Sabry MI, Hassan SSA, Zaki MM, Stino FKR. Stocking density: A clue for improving social behavior, welfare, health indices along with productivity performances of quail (Coturnix coturnix)—A review. Trop Anim Health Prod. 2022;54(1):83. doi: 1007/s11250-022-03083-0.
  12. Zabir M, et al. Impacts of stocking density rates on welfare, growth, and hemato-biochemical profile in broiler chickens. J Adv Vet Anim Res. 2021;8(4):642–649. doi: 5455/javar.2021.h556.
  13. Jhetam S. The impact of stocking density on the performance, health and welfare of turkey hens [thesis]. 2021. Accessed 2026 Mar 27. Available from: https://harvest.usask.ca/bitstream/10388/
    13514/1/JHETAM-THESIS-2021.pdf
  14. Van Limbergen T, et al. Risk factors for poor health and performance in European broiler production systems. BMC Vet Res. 2020;16(1). doi: 1186/s12917-020-02484-3.
  15. De Jong IC, Guémené D. Major welfare issues in broiler breeders. Worlds Poult Sci J. 2011;67(1):73–82. doi: 1017/S0043933911000067.
  16. Meseret S. A review of poultry welfare in conventional production system. Livest Res Rural Dev. 2016;28(12). Accessed 2026 Mar 27. Available from: https://www.researchgate.net/profile/Selam-Meseret/publication/311321712_A_review_of_poultry_welfare_in_conventional_production_system/links/58419bc908ae8e63e6218f2e/A-review-of-poultry-welfare-in-conventional-production-system.pdf.
  17. Karaarslan S, Nazlıgül A. Effects of lighting, stocking density, and access to perches on leg health variables as welfare indicators in broiler chickens. Livest Sci. 2018;218:31–36. doi: 1016/j.livsci.2018.10.008.
  18. Thomas DG, et al. Influence of stocking density on the performance, carcass characteristics and selected welfare indicators of broiler chickens. N Z Vet J. 2004;52(2):76–81. doi: 1080/00480169.2004.36408.
  19. McLean JA, Savory CJ, Sparks NHC. Welfare of male and female broiler chickens in relation to stocking density, as indicated by performance, health and behaviour. Anim Welf. 2002;11(1):55–73. doi: 1017/S0962728600024313.
  20. Abudabos AM, Samara EM, Hussein EOS, Al-Ghadi MQ, Al-Atiyat RM. Impacts of stocking density on the performance and welfare of broiler chickens. Ital J Anim Sci. 2013;12(1):66–71. doi: 4081/ijas.2013.e11.
  21. Estevez I. Density allowances for broilers: Where to set the limits? Poult Sci. 2007;86(6):1265–1272. doi: 1093/ps/86.6.1265.
  22. Simitzis PE, et al. Impact of stocking density on broiler growth performance, meat characteristics, behavioural components and indicators of physiological and oxidative stress. Br Poult Sci. 2012;53(6):721–730. doi: 1080/00071668.2012.745930.
  23. Bessei W. Welfare of broilers: A review. Worlds Poult Sci J. 2006;62(3). doi: 1079/WPS2005108.
  24. Erasmus MA. A review of the effects of stocking density on Turkey behavior, welfare, and productivity. Poult Sci. 2017;96(8):2540–2545. doi: 3382/ps/pex075.
  25. Ravindran V, Thomas DV, Thomas DG, Morel PCH. Performance and welfare of broilers as affected by stocking density and zinc bacitracin supplementation. N Z Vet J. 2006;77(1):110–116. doi: 1111/j.1740-0929.2006.00327.x.
  26. Bailie CL, Ijichi C, O’Connell NE. Effects of stocking density and string provision on welfare-related measures in commercial broiler chickens in windowed houses. Poult Sci. 2018;97(5):1503–1510. doi: 3382/ps/pey026.
  27. Houshmand M, Azhar K, Zulkifli I, Bejo MH, Kamyab A. Effects of prebiotic, protein level, and stocking density on performance, immunity, and stress indicators of broilers. Poult Sci. 2012;91(2):393–401. doi: 3382/ps.2010-01050.
  28. Skrbic Z, Pavlovski Z, Lukic M, Petricevic V, Djukic-Stojcic M, Zikic D. The effect of stocking density on individual broiler welfare parameters: 2. Different broiler stocking densities. Biotechnol Anim Husb. 2011;27(1):17–24. doi: 2298/BAH1101017S.
  29. Li XM, et al. Effects of stocking density on growth performance, growth regulatory factors, and endocrine hormones in broilers under appropriate environments. Poult Sci. 2019;98(12):6611–6617. doi: 3382/ps/pez505.
  30. Goo D, Kim JH, Park GH, Delos Reyes JB, Kil DY. Effect of stocking density and dietary tryptophan on growth performance and intestinal barrier function in broiler chickens. Poult Sci. 2019;98(10):4504–4508. doi: 3382/ps/pez215.
  31. Nicol CJ, et al. Effects of stocking density, flock size and management on the welfare of laying hens in single-tier aviaries. Br Poult Sci. 2006;47(2):135–146. doi: 1080/00071660600610609.
  32. Martrenchar A, Huonnic D, Cotte JP, Boilletot E, Morisse JP. Influence of stocking density on behavioural, health and productivity traits of turkeys in large flocks. Br Poult Sci. 1999;40(3):323–331. doi: 1080/00071669987403.
  33. Hall AL. The effect of stocking density on the welfare and behaviour of broiler chickens reared commercially. Anim Welf. 2001;10(1):23–40. doi: 1017/S096272860002323X.
  34. Najafi P, et al. Environmental temperature and stocking density effects on acute phase proteins, heat shock protein 70, circulating corticosterone and performance in broiler chickens. Int J Biometeorol. 2015;59(11):1577–1583. doi: 1007/s00484-015-0964-3.
  35. Tsiouris V, Georgopoulou I, Batzios C, Pappaioannou N, Ducatelle R, Fortomaris P. High stocking density as a predisposing factor for necrotic enteritis in broiler chicks. Avian Pathol. 2015;44(2):59–66. doi: 1080/03079457.2014.1000820.
  36. Buijs S, Keeling L, Rettenbacher S, van Poucke E, Tuyttens FAM. Stocking density effects on broiler welfare: Identifying sensitive ranges for different indicators. Poult Sci. 2009;88(8):1536–1543. doi: 3382/ps.2009-00007.
  37. Meluzzi A, et al. Welfare of broiler chickens. Ital J Anim Sci. 2009;8(Suppl 1):161–173. doi: 4081/ijas.2009.s1.161.
  38. Hall AL. The effect of stocking density on the welfare and behaviour of broiler chickens reared commercially. Anim Welf. 2001;10(1):23–40. doi: 1017/S096272860002323X.

Regular Issue Subscription Review Article
Volume 16
Issue 02
Received 02/04/2026
Accepted 14/05/2026
Published 14/05/2026
Publication Time 42 Days


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