Analyze Diet
Animals : an open access journal from MDPI2025; 15(11); doi: 10.3390/ani15111525

Stoicism or Defeat? The Psychological Impact of the Kiln Environment on Working Donkeys and Mules.

Abstract: One of the most problematic situations for the estimated 60 million working donkeys and mules across the world is within the brick kiln environment. In countries such as Egypt, Nepal, India and Pakistan, donkeys and mules carry dried bricks into small kilns either by pulling carts or carrying loaded packs. The health and welfare problems of this environment are well documented: they may carry excessive loads; work long hours, have difficulties accessing food, water and rest options; and can frequently suffer untreated illnesses including dental problems, lameness and open wounds from poorly fitting harnesses and aggressive handlers. The impact of this environment on their mental health has been largely overlooked. We use a behavioral comparative analogy approach, comparing the clinical signs and risk factors associated with learned helplessness, depression and complex post-traumatic stress disorder (cPTSD) in humans and laboratory studies in other animals with evidence from the veterinary literature. Based on an analysis of seven quantitative veterinary studies that have evaluated the health and behavior of kiln donkeys and mules, we argue that their behavior may be consistent with learned helplessness, depression and/or cPTSD. Furthermore, the kiln environment contains many of the key environmental risk factors associated with the development of these disorders. And, because of certain behavioral differences from horses, donkeys and mules are at greater risk of their physical and mental health being overlooked. This finding, adding to the wealth of evidence for their poor health, should further strengthen efforts to replace their use in the kiln environment.
Publication Date: 2025-05-23 PubMed ID: 40508991PubMed Central: PMC12153751DOI: 10.3390/ani15111525Google Scholar: Lookup
The Equine Research Bank provides access to a large database of publicly available scientific literature. Inclusion in the Research Bank does not imply endorsement of study methods or findings by Mad Barn.
  • Journal Article
  • Review

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The research discusses the harsh conditions faced by working donkeys and mules in the brick kiln environment globally, specifically in countries like Egypt, Nepal, India, and Pakistan. The paper details the severe physical and psychological challenges these animals face and how they might exhibit signs of learned helplessness, depression, and complex post-traumatic stress disorder (cPTSD).

Working Conditions and Health Concerns

  • The research identifies that donkeys and mules in brick kilns often face extreme hardships. From carrying excessive loads and working long hours, to experiencing limited access to food, water, and rest, the working conditions are particularly harsh.
  • Moreover, the animals often suffer from untreated illnesses such as dental problems, lameness, and open wounds. These are typically a result of ill-fitting harnesses and aggression from handlers.

Psychological Impact

  • The paper reveals that in addition to the physical health challenges, the mental wellbeing of these animals has been largely overlooked. The study applies a behavioral comparative analogy approach, comparing the signs associated with learned helplessness, depression, and cPTSD in humans and other animals to the behavior witnessed in donkeys and mules working in brick kilns.
  • The findings indicate that the behaviors of these animals could be consistent with these mental health conditions. The brick kiln working environment also includes many of the key risk factors associated with the development of these disorders.

Consequences and Implications

  • Interestingly, it’s noted that due to certain behavioral differences, the physical and mental health issues of donkeys and mules are more likely to be overlooked when compared to horses. This introduces an additional layer of risk for these animals.
  • The results of the study underscore the need to end the use of donkeys and mules in this industry. Thorough understanding of these conditions and the stark realities faced by the animals should bolster efforts to replace their use in these harsh working environments.

Cite This Article

APA
Taylor K, Harrison A, Capaldo T. (2025). Stoicism or Defeat? The Psychological Impact of the Kiln Environment on Working Donkeys and Mules. Animals (Basel), 15(11). https://doi.org/10.3390/ani15111525

Publication

ISSN: 2076-2615
NlmUniqueID: 101635614
Country: Switzerland
Language: English
Volume: 15
Issue: 11

Researcher Affiliations

Taylor, Katy
  • Independent Researcher, Sheffield, UK.
Harrison, Anna
  • Independent Researcher, Exeter, UK.
Capaldo, Theodora
  • American Fund for Alternatives to Animal Research, Georgetown, MA 01833, USA.

Grant Funding

  • n/a / American Fund for Alternatives to Animal Research

Conflict of Interest Statement

T.C. is a trustee of the funding body, AFAAR. K.T. was funded by AFAAR to draft the paper. A.H. declares no conflicts of interest. The funder was not involved in the study design, collection, analysis, interpretation of data, the writing of this article or the decision to submit it for publication.

References

This article includes 59 references
  1. Norris SL, Little HA, Ryding J, Raw Z. Global donkey and mule populations: Figures and trends.. PLoS ONE 2021;16:e0247830.
  2. Norris SL, Kubasiewicz LM, Watson TL, Little HA, Yadav AK, Thapa S, Raw Z, Burden FA. A new framework for assessing equid welfare: A case study of working equids in Nepalese brick kilns.. Animals 2020;10:1074.
    doi: 10.3390/ani10061074pmc: PMC7341268pubmed: 32580418google scholar: lookup
  3. Burn CC, Dennison TL, Whay HR. Environmental and demographic risk factors for poor welfare in working horses, donkeys and mules in developing countries.. Vet. J. 2010;186:385–392.
    doi: 10.1016/j.tvjl.2009.09.016pubmed: 19926316google scholar: lookup
  4. Watson TL, Kubasiewicz LM, Chamberlain N, Nye C, Raw Z, Burden FA. Cultural “Blind Spots”, Social Influence and the Welfare of Working Donkeys in Brick Kilns in Northern India.. Front. Vet. Sci. 2020;7:214.
    doi: 10.3389/fvets.2020.00214pmc: PMC7201042pubmed: 32411736google scholar: lookup
  5. Farhat SF, McLean AK, Mahmoud HFF. Welfare Assessment and Identification of the Associated Risk Factors Compromising the Welfare of Working Donkeys (Equus asinus) in Egyptian Brick Kilns.. Animals 2020;10:1611.
    doi: 10.3390/ani10091611pmc: PMC7552282pubmed: 32917031google scholar: lookup
  6. Ali ABA, El Sayed MA, McLean AK, Heleski CR. Aggression in working mules and subsequent aggressive treatment by their handlers in Egyptian brick kilns: Cause or effect?. J. Vet. Behav. 2019;29:95–101.
  7. Bukhari SSUH, Rosanowski SM, McElligott AG, Parkes RSV. Welfare Concerns for Mounted Load Carrying by Working Donkeys in Pakistan.. Front. Vet. Sci. 2022;9:886020.
    doi: 10.3389/fvets.2022.886020pmc: PMC9186103pubmed: 35692297google scholar: lookup
  8. Kubasiewicz LM, Watson T, Nye C, Chamberlain N, Perumal RK, Saroja R, Norris SL, Raw Z, Burden FA. Bonded labour and donkey ownership in the brick kilns of India: A need for reform of policy and practice.. Anim. Welf. 2023;32:e8.
    doi: 10.1017/awf.2023.1pmc: PMC10936255pubmed: 38487459google scholar: lookup
  9. Regan FH, Hockenhull J, Pritchard JC, Waterman-Pearson AE, Whay HR. Behavioural repertoire of working donkeys and consistency of behaviour over time, as a preliminary step towards identifying pain-related behaviours.. PLoS ONE 2014;9:e101877.
  10. Duke C. Horses Stand Up to Sleep but Lie Down Perchance to Dream.. Scientific American Jun 12, 2023.
  11. Ali ABA, Matoock MY, Fouad MA, Heleski CR. Are mules or donkeys better adapted for Egyptian brick kiln work? (Until we can change the kilns). J. Vet. Behav. 2015;10:158–165.
  12. Burn CC, Dennison TL, Whay HR. Relationships between behaviour and health in working horses, donkeys, and mules in developing countries.. Appl. Anim. Behav. Sci. 2010;126:109–118.
  13. Pritchard JC, Barr AR, Whay HR. Validity of a behavioural measure of heat stress and a skin tent test for dehydration in working horses and donkeys.. Equine Vet. J. 2006;38:433–438.
    doi: 10.2746/042516406778400646pubmed: 16986604google scholar: lookup
  14. Hall C, Goodwin D, Heleski C, Randle H, Waran N. Is there evidence of learned helplessness in horses?. J. Appl. Anim. Welf. Sci. 2008;11:249–266.
    doi: 10.1080/10888700802101130pubmed: 18569222google scholar: lookup
  15. Overmier JB, Seligman ME. Effects of inescapable shock upon subsequent escape and avoidance responding.. J. Comp. Physiol. Psychol. 1967;63:28–33.
    doi: 10.1037/h0024166pubmed: 6029715google scholar: lookup
  16. Seligman ME, Maier SF. Failure to escape traumatic shock.. J. Exp. Psychol. 1967;74:1–9.
    doi: 10.1037/h0024514pubmed: 6032570google scholar: lookup
  17. Maier SF, Seligman ME. Learned helplessness: Theory and evidence.. J. Exp. Psychol. General. 1976;105:3–46.
    doi: 10.1037/0096-3445.105.1.3google scholar: lookup
  18. Weinraub M, Schulman A. Coping behaviour: Learned helplessness, physiological change and learned inactivity.. Behav. Res. Ther. 1980;18:459–512.
    pubmed: 7436992
  19. Maier SF, Seligman ME. Learned helplessness at fifty: Insights from neuroscience.. Psychol. Rev. 2016;123:349–367.
    doi: 10.1037/rev0000033pmc: PMC4920136pubmed: 27337390google scholar: lookup
  20. Cabib S. The Neurobiology of Stereotypy II: The Role of Stress.. In: Mason G., Rushen J., editors. Stereotypic Animal Behaviour: Fundamentals and Applications to Welfare. 2nd ed. CABI; Oxon, UK: 2006. pp. 227–255.
  21. Seligman MEP. Depression and learned helplessness.. In: Friedman RJ, Katz MM, editors. The Psychology of Depression: Contemporary Theory and Research. Winston-Wiley; New York, NY, USA: 1974. pp. 83–113.
  22. . International Classification of Diseases, Eleventh Revision (ICD-11), 2019/2021. 6B41 Complex Post Traumatic Stress Disorder.. World Health Organization (WHO) 2021.
  23. Fureix C, Beaulieu C, Argaud S, Rochais C, Quinton M, Henry S, Hausberger M, Mason G. Investigating anhedonia in a non-conventional species: Do some riding horses Equus caballus display symptoms of depression?. Appl. Anim. Behav. Sci. 2015;162:26–36.
  24. Bradshaw GA, Capaldo T, Lindner L, Grow G. Building an Inner Sanctuary: Complex PTSD in Chimpanzees.. J. Trauma Dissociation. 2008;9:9–34.
    doi: 10.1080/15299730802073619pubmed: 19042307google scholar: lookup
  25. Ferdowsian HR, Durham DL, Kimwele C, Kranendonk G, Otali E, Akugizibwe T, Mulcahy JB, Ajarova L, Johnson CM. Signs of mood and anxiety disorders in chimpanzees.. PLoS ONE 2011;6:e19855.
  26. Couto C, Pilati R. Adaptation of the Learned Helplessness Scale in Brazil.. Psicol. Teor. Pesqui. 2023;39:e39.
  27. McKean KJ. Using Multiple Risk Factors to Assess the Behavioral, Cognitive, and Affective Effects of Learned Helplessness.. J. Psychol. 1994;128:177–183.
    doi: 10.1080/00223980.1994.9712721pubmed: 8189396google scholar: lookup
  28. American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders.. 5th ed. American Psychiatric Association; Washington, DC, USA: 2022. Text Revision.
  29. Seewoo BJ, Hennessy LA, Feindel KW, Etherington SJ, Croarkin PE, Rodger J. Validation of Chronic Restraint Stress Model in Young Adult Rats for the Study of Depression Using Longitudinal Multimodal MR Imaging.. eNeuro 2020;7.
    doi: 10.1523/ENEURO.0113-20.2020pmc: PMC7396811pubmed: 32669346google scholar: lookup
  30. Chieze M, Hurst S, Kaiser S, Sentissi O. Effects of Seclusion and Restraint in Adult Psychiatry: A Systematic Review.. Front. Psychiatry 2019;10:491.
    doi: 10.3389/fpsyt.2019.00491pmc: PMC6673758pubmed: 31404294google scholar: lookup
  31. Song J, Kim YK. Animal models for the study of depressive disorder.. CNS Neurosci. Ther. 2021;27:633–642.
    doi: 10.1111/cns.13622pmc: PMC8111503pubmed: 33650178google scholar: lookup
  32. Radell ML, Abo Hamza EG, Daghustani WH, Perveen A, Moustafa AA. The Impact of Different Types of Abuse on Depression.. Depress. Res. Treat. 2021;2021:6654503.
    doi: 10.1155/2021/6654503pmc: PMC8060108pubmed: 33936814google scholar: lookup
  33. Bargai N, Ben-Shakhar G, Shalev AY. Posttraumatic stress disorder and depression in battered women: The mediating role of learned helplessness.. J. Fam. Violence 2007;22:267–275.
    doi: 10.1007/s10896-007-9078-ygoogle scholar: lookup
  34. Moyano S, Scolnik M, Vergara F, Garcia MV, Sabelli MR, Rosa JE, Catoggio LJ, Soriano ER. Evaluation of Learned Helplessness, Perceived Self-efficacy, and Functional Capacity in Patients With Fibromyalgia and Rheumatoid Arthritis.. J. Clin. Rheumatol. 2019;25:65–68.
    doi: 10.1097/RHU.0000000000000769pubmed: 29620593google scholar: lookup
  35. Bagheri Sheykhangafshe F, Farahani H, Dehghani M, Fathi-Ashtiani A. Examining Psychological Distress and Learned Helplessness in Iranians Chronic Pain Patients with Differing Post-traumatic Stress Disorder Intensity: A Comparative Study.. Mod. Care J. 2024;21:e149837.
    doi: 10.5812/mcj-149837google scholar: lookup
  36. Aguera-Ortiz L, Failde I, Mico JA, Cervilla J, Lopez-Ibor JJ. Pain as a symptom of depression: Prevalence and clinical correlates in patients attending psychiatric clinics.. J. Affect. Disord. 2011;130:106–112.
    doi: 10.1016/j.jad.2010.10.022pubmed: 21055826google scholar: lookup
  37. Cao D, Zhao Y, Wang Y, Wei D, Yan M, Su S, Pan H, Wang Q. Effects of sleep deprivation on anxiety-depressive-like behavior and neuroinflammation.. Brain Res. 2024;1836:148916.
  38. Muscatell KA, Slavich GM, Monroe SM, Gotlib IH. Stressful life events, chronic difficulties, and the symptoms of clinical depression.. J. Nerv. Ment. Dis. 2009;197:154–160.
  39. Brown ED, Seyler MD, Knorr AM, Garnett ML, Laurenceau J. Daily poverty-related stress and coping: Associations with child learned helplessness.. Fam. Relat. 2016;65:591–602.
    doi: 10.1111/fare.12217google scholar: lookup
  40. Riemann D, Krone LB, Wulff K, Nissen C. Sleep, insomnia, and depression.. Neuropsychopharmacology 2020;45:74–89.
    doi: 10.1038/s41386-019-0411-ypmc: PMC6879516pubmed: 31071719google scholar: lookup
  41. Dan R, Brown AR, Hutson L, Belleau EL, Esfand SM, Ruberto V, Johns E, Null KE, Du F, Pizzagalli DA. Brain encoding during perceived control as a prospective predictor of improvement in quality of life.. Soc. Cogn. Affect. Neurosci. 2024;19:nsae075.
    doi: 10.1093/scan/nsae075pmc: PMC11556337pubmed: 39420578google scholar: lookup
  42. Ross LT, Hood CO, Short SD. Unpredictability and symptoms of depression and anxiety.. J. Soc. Clin. Psychol. 2016;35:371–385.
  43. Kubasiewicz LM, Watson T, Norris SL, Chamberlain N, Nye C, Perumal RK, Saroja R, Raw Z, Burden F. One welfare: Linking poverty, equid ownership and equid welfare in the brick kilns of India.. Anim. Welf. 2022;31:517–528.
    doi: 10.1017/S0962728600032504pmc: PMC10936267pubmed: 38487452google scholar: lookup
  44. Pritchard JC, Lindberg AC, Main DCJ, Whay HR. Assessment of the welfare of working horses, mules and donkeys, using health and behaviour parameters.. Prev. Vet. Med. 2005;69:265–283.
  45. Raw Z, Rodrigues JB, Rickards K, Ryding J, Norris SL, Judge A, Kubasiewicz LM, Watson TL, Little H, Hart B. Equid Assessment, Research and Scoping (EARS): The Development and Implementation of a New Equid Welfare Assessment and Monitoring Tool.. Animals 2020;10:297.
    doi: 10.3390/ani10020297pmc: PMC7070371pubmed: 32069910google scholar: lookup
  46. Bukhari SSUH, McElligott AG, Rosanowski SM, Parkes RSV. Recognition of emotion and pain by owners benefits the welfare of donkeys in a challenging working environment.. Peer J. 2023;11:e15747.
    doi: 10.7717/peerj.15747pmc: PMC10416770pubmed: 37576503google scholar: lookup
  47. Upjohn M, Wells K. Working equids: The welfare of those worked to their limit.. In: Grandin T., Whiting M., editors. Are We Pushing Animals to Their Biological Limits? Welfare and Ethical Implications. CABI; Wallingford, UK: 2018.
  48. Swann WJ. Improving the welfare of working equine animals in developing countries.. Appl. Anim. Behav. Sci. 2006;100:148–151.
  49. Popescu S, Diugan E-A. The Relationship Between Behavioral and Other Welfare Indicators of Working Horses.. J. Equine Vet. Sci. 2013;33:1–12.
  50. Mason GJ, Latham NR. Can’t stop, won’t stop: Is stereotypy a reliable animal welfare indicator?. Anim. Welf. 2004;13:S57–S69.
    doi: 10.1017/S096272860001438Xgoogle scholar: lookup
  51. McLean AK, Navas González FJ, Canisso IF. Donkey and Mule Behavior.. Vet. Clin. N. Am. Equine Pract. 2019;35:575–588.
    doi: 10.1016/j.cveq.2019.08.010pubmed: 31672203google scholar: lookup
  52. Fureix C, Walker M, Harper L, Reynolds K, Saldivia-Woo A, Mason G. Stereotypic behaviour in standard non-enriched cages is an alternative to depression-like responses in C57BL/6 mice.. Behav. Brain Res. 2016;305:186–190.
    doi: 10.1016/j.bbr.2016.02.005pubmed: 26876137google scholar: lookup
  53. Burden F, Thiemann A. Donkeys Are different.. J. Equine Vet. Sci. 2015;35:376–382.
  54. McLean A, Varnum A, Ali A, Heleski C, Navas González FJ. Comparing and contrasting knowledge on mules and hinnies as a tool to comprehend their behavior and improve their welfare.. Animals 2019;9:488.
    doi: 10.3390/ani9080488pmc: PMC6719969pubmed: 31357421google scholar: lookup
  55. Regan FH, Hockenhull J, Pritchard JC, Waterman-Pearson AE, Whay HR. Clinical abnormalities in working donkeys and their associations with behaviour.. Vet. Rec. Open. 2015;2:e000105.
    doi: 10.1136/vetreco-2014-000105pmc: PMC4567160pubmed: 26392903google scholar: lookup
  56. Gross G. A brief history of donkeys.. Curr. Biol. 2022;32:985–987.
    doi: 10.1016/j.cub.2022.09.031google scholar: lookup
  57. Pearson RA, Nengomasha E, Krecek R. The challenges in using donkeys for work in Africa.. In: Starkey P., Kaumbutho P., editors. Meeting the Challenges of Animal Traction. A Resource Book of the Animal Traction Network for Eastern and Southern Africa (ATNESA) Intermediate Technology Publications; London, UK: 1999.
  58. Polidori P, Vincenzetti S. Farm management and feeding strategies for donkey milk production.. In: Gorawala P., Mandhatri S., editors. Agricultural Research Updates. Nova, Science and Technology Special Topics; Hauppauge, NY, USA: 2017. pp. 93–109.
  59. Bharadwaj S, Chittora RK, Upreti NC, Chougule S. Impact of mechanisation on socio-economic condition of donkey guardians of District Sangli, Maharashtra, India.. Int. J. Ed. Soc. Sci. Res. 2022;5:252–260.
    doi: 10.37500/IJESSR.2022.5121google scholar: lookup