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Identifying and monitoring pain in farm animals: a review

  • A. Prunier (a1), L. Mounier (a2) (a3), P. Le Neindre (a4), C. Leterrier (a5), P. Mormède (a6), V. Paulmier (a3), P. Prunet (a7), C. Terlouw (a3) and R. Guatteo (a8)...

One important objective for animal welfare is to maintain animals free from pain, injury or disease. Therefore, detecting and evaluating the intensity of animal pain is crucial. As animals cannot directly communicate their feelings, it is necessary to identify sensitive and specific indicators that can be easily used. The aim of the present paper is to review relevant indicators to assess pain in several farm species. The term pain is used for mammals, birds and fish, even though the abilities of the various species to experience the emotional component of pain may be different. Numerous behavioural changes are associated with pain and many of them could be used on farms to assess the degree of pain being experienced by an animal. Pain, as a stressor, is associated with variations in the hypothalamic–pituitary–adrenal axis as well as in the sympathetic and immune systems that can be used to identify the presence of pain rapidly after it started. However, most of these measures need sophisticated equipment for their assessment. Therefore, they are mainly adapted to experimental situations. Injuries and other lesional indicators give information on the sources of pain and are convenient to use in all types of situations. Histopathological analyses can identify sources of pain in experimental studies. When pronounced and/or long lasting, the pain-induced behavioural and physiological changes can decrease production performance. Some indicators are very specific and sensitive to pain, whereas others are more generally related to stressful situations. The latter can be used to indicate that animals are suffering from something, which may be pain. Overall, this literature review shows that several indicators exist to assess pain in mammals, a few in birds and very few in fish. Even if in some cases, a single indicator, usually a behavioural indicator, may be sufficient to detect pain, combining various types of indicators increases sensitivity and specificity of pain assessment. Research is needed to build and validate new indicators and to develop systems of pain assessment adapted to each type of situation and each species.

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JC Abbott , LM Dill 1985. Patterns of aggressive attack in juvenile stellhead trout (Salmo-Gairdneri). Canadian Journal of Fisheries and Aquatic Sciences 42, 17021706.

V Allain , L Mirabito , C Arnould , M Colas , S LeBouquin , C Lupo , V Michel 2009. Skin lesions in broiler chickens measured at the slaughterhouse: relationships between lesions and between their prevalence and rearing factors. British Poultry Science 50, 407417.

BA Barton , GK Iwama 1991. Physiological changes in fish from stress in aquaculture with emphasis on the response and effects of corticosteroids. Annual Review of Fish Diseases 1, 326.

RC Bicalho , F Vokey , HN Erb , CL Guard 2007. Visual locomotion scoring in the first seventy days in milk: impact on pregnancy and survival. Journal of Dairy Science 90, 45864591.

J Bintz 1971. Between- and within-subject effect of shock intensity on avoidance in goldfish (Carassius auratus). Journal of Comparative and Physiological Psychology 75, 9297.

P Borghetti , R Saleri , E Mocchegiani , A Corradi , P Martelli 2009. Infection, immunity and the neuroendocrine response. Veterinary Immunology and Immunopathology 130, 141162.

J Breward , MJ Gentle 1985. Neuroma formation and abnormal afferent nerve discharges after partial beak amputation (beak trimming) in poultry. Experientia 41, 11321134.

A Bright 2008. Vocalisations and acoustic parameters of flock noise from feather pecking and non-feather pecking laying flocks. British Poultry Science 49, 241249.

JME Brown , SA Edwards , WJ Smith , E Thompson , J Duncan 1996. Welfare and production implications of teeth clipping and iron injection of piglets in outdoor systems in Scotland. Preventive Veterinary Medicine 27, 95105.

N Capion , SM Thamsborg , C Enevoldsen 2009. Prevalence and severity of foot lesions in Danish Holstein heifers through first lactation. Veterinary Journal 182, 5058.

JA Carroll 2008. Bidirectional communication: growth and immunity in domestic livestock. Journal of Animal Science 86, E126E137.

JA Carroll , EL Berg , TA Strauch , MP Roberts , HG Kattesh 2006. Hormonal profiles, behavioral responses, and short-term growth performance after castration of pigs at three, six, nine, or twelve days of age. Journal of Animal Science 84, 12711278.

RDH Cohen , BD King , LR Thomas , ED Janzen 1990. Efficacy and stress of chemical versus surgical castration of cattle. Canadian Journal of Animal Science 70, 10631072.

NE Collias 1987. The vocal repertoire of the Red Junglefowl: a spectrographic classification and the code of communication. The Condor 89, 510524.

GS Davis , KE Anderson , DR Jones 2004. The effects of different beak trimming techniques on plasma corticosterone and performance criteria in single comb White Leghorn hens. Poultry Science 83, 16241628.

IJ Duncan , ER Beatty , PM Hocking , SR Duff 1991. Assessment of pain associated with degenerative hip disorders in adult male turkeys. Research in Veterinary Science 50, 200203.

R Dunlop , S Millsopp , P Laming 2006. Avoidance learning in goldfish (Carassius auratus) and trout (Oncorhynchus mykiss) and implications for pain perception. Applied Animal Behaviour Science 97, 255271.

B Earley , MA Crowe 2002. Effects of ketoprofen alone or in combination with local anesthesia during the castration of bull calves on plasma cortisol, immunological, and inflammatory responses. Journal of Animal Science 80, 10441052.

RH Ehrensing , GF Michell , AJ Kastin 1982. Similar antagonism of morphine analgesia by MIF-1 and naloxone in Carassius auratus. Pharmacology Biochemistry and Behavior 17, 757761.

SD Eicher , JL Morrow-Tesch , JL Albright , JW Dailey , CR Young , LH Stanker 2000. Tail-docking influences on behavioral, immunological, and endocrine responses in dairy heifers. Journal of Dairy Science 83, 14561462.

TH Elsasser , KC Klasing , N Filipov , F Thompson 2000. The metabolic consequences of stress: targets for stress and priorities of nutrient use. In The biology of animal stress. Basic principles and implications for animal welfare (ed. GP Moberg and JA Mench), pp. 77110. CABI Publishing, Wallingford, UK.

HC Evrard , J Balthazart 2002. The assessment of nociceptive and non-nociceptive skin sensitivity in the Japanese quail (Coturnix japonica). Journal of Neuroscience Methods 116, 135146.

X Fernandez , P Levasseur , P Ecolan , W Wittmann 1995. Effect of epinephrine administration on glycogen-metabolism in red and white muscle of anesthetized pigs (Sus Scrofa domesticus). Journal of the Science of Food and Agriculture 68, 231239.

AD Fisher , MA Crowe , MEA delaVarga , WJ Enright 1996. Effect of castration method and the provision of local anesthesia on plasma cortisol, scrotal circumference, growth, and feed intake of bull calves. Journal of Animal Science 74, 23362343.

FC Flower , DM Weary 2006. Effect of hoof pathologies on subjective assessments of dairy cow gait. Journal of Dairy Science 89, 139146.

C Fourichon , H Seegers , N Bareille , F Beaudeau 1999. Effects of disease on milk production in the dairy cow: a review. Preventive Veterinary Medicine 41, 135.

D Fraser , BK Thompson 1991. Armed sibling rivalry among suckling piglets. Behavioural Ecology and Sociobiology 29, 915.

M Gallois , YL Cozler , A Prunier 2005. Influence of tooth resection in piglets on welfare and performance. Preventive Veterinary Medicine 69, 1323.

MJ Gentle 1974. Changes in habituation of the EEG to water deprivation and crop loading in Gallus domesticus. Physiology & Behavior 13, 1519.

MJ Gentle 2011. Pain issues in poultry. Applied Animal Behaviour Science 135, 252258.

MJ Gentle , LN Hunder 1991. Physiological and behavioural responses associated with feather removal in Gallus gallus var domesticus. Research in Veterinary Science 50, 95101.

MJ Gentle , SA Corr 1995. Endogenous analgesia in the chicken. Neuroscience Letters 201, 211214.

MJ Gentle , RB Jones , SC Woolley 1989. Physiological changes during tonic immobility in Gallus gallus var domesticus. Physiology & Behavior 46, 843847.

MJ Gentle , BH Thorp , BO Hughes 1995. Anatomical consequences of partial beak amputation (beak trimming) in turkeys. Research in Veterinary Science 58, 158162.

TJ Gibson , CB Johnson , KJ Stafford , SL Mitchinson , DJ Mellor 2007. Validation of the acute electroencephalographic responses of calves to noxious stimulus with scoop dehorning. New Zealand Veterinary Journal 55, 152157.

CE Gillman , AL KilBride , P Ossent , LE Green 2009. A cross-sectional study of the prevalence of foot lesions in post-weaning pigs and risks associated with floor type on commercial farms in England. Preventive Veterinary Medicine 91, 146152.

PC Glatz 1987. Effects of beak trimming and restraint on heart rate, food intake, body weight and egg production in hens. British Poultry Science 28, 601611.

PC Glatz 2000. Beak trimming methods – review. Asian-Australasian Journal of Animal Sciences 13, 16191637.

PC Glatz , CA Lunam 1994. Production and heart-rate responses of chickens beak-trimmed at hatch or at 10 or 42 days of age. Australian Journal of Experimental Agriculture 34, 443447.

MJ Graham , JE Kent , V Molony 1997. Effects of four analgesic treatments on the behavioural and cortisol responses of 3-week-old lambs to tail docking. Veterinary Journal 153, 8797.

C Grant 2004. Behavioural responses of lambs to common painful husbandry procedures. Applied Animal Behaviour Science 87, 255273.

HA Haga , B Ranheim 2005. Castration of piglets: the analgesic effects of intratesticular and intrafunicular lidocaine injection. Veterinary Anaesthesia and Analgesia 32, 19.

M Hay , A Vulin , S Génin , P Sales , A Prunier 2003. Assessment of pain induced by castration in piglets: behavioral and physiological responses over the subsequent 5 days. Applied Animal Behaviour Science 82, 201218.

K Herr , K Bjoro , S Decker 2006. Tools for assessment of pain in nonverbal older adults with dementia: a state-of-the-science review. Journal of Pain and Symptom Management 31, 170192.

MS Herskin , R Muller , L Schrader , J Ladewig 2003. A laser-based method to measure thermal nociception in dairy cows: short-term repeatability and effects of power output and skin condition. Journal of Animal Science 81, 945954.

PM Hocking , MJ Gentle , R Bernard , LN Dunn 1997. Evaluation of a protocol for determining the effectiveness of pretreatment with local analgesics for reducing experimentally induced articular pain in domestic fowl. Research in Veterinary Science 63, 263267.

PM Hocking , GW Robertson , MJ Gentle 2001. Effects of anti-inflammatory steroid drugs on pain coping behaviours in a model of articular pain in the domestic fowl. Research in Veterinary Science 71, 161166.

L Holton , J Reid , EM Scott , P Pawson , A Nolan 2001. Development of a behaviour-based scale to measure acute pain in dogs. Veterinary Record 148, 525531.

S Jarvis , KA McLean , J Chirnside , LA Deans , SK Calvert , V Molony , AB Lawrence 1997. Opioid-mediated changes in nociceptive threshold during pregnancy and parturition in the sow. Pain 72, 153159.

SC Kestin , TG Knowles , AE Tinch , NG Gregory 1992. Prevalence of leg weakness in broiler chickens and its relationship with genotype. Veterinary Record 131, 190194.

LA Lamont , WJ Tranquilli , KA Grimm 2000. Physiology of pain. Veterinary Clinics of North America, Small Animal Practice 30, 703728.

DC Lay , TH Friend , RD Randel , CL Bowers , KK Grissom , OC Jenkins 1992b. Behavioral and physiological effects of freeze or hot-iron branding on crossbred cattle. Journal of Animal Science 70, 330336.

D Lay , T Friend , K Grissom , C Bowers , M Mal 1992c. Effects of freeze or hot-iron branding of Angus calves on some physiological and behavioral indicators of stress. Applied Animal Behaviour Science 33, 137147.

KA Leach , S Dippel , J Huber , S March , C Winckler , HR Whay 2009. Assessing lameness in cows kept in tie-stalls. Journal of Dairy Science 92, 15671574.

SJ Lester , DJ Mellor , RN Ward , RJ Holmes 1991. Cortisol responses of young lambs to castration and tailing using different methods. New Zealand Veterinary Journal 39, 134138.

SJ Lester , DJ Mellor , RJ Holmes , RN Ward , KJ Stafford 1996. Behavioural and cortisol responses of lambs to castration and tailing using different methods. New Zealand Veterinary Journal 44, 4554.

C Leterrier , Y Nys 1992. Clinical and anatomical differences in varus and valgus deformities of chick limbs suggest different etiopathogenesis. Avian Pathology 21, 429442.

J Lewin-Kowalik , W Marcol , K Kotulska , M Mandera , A Klimczak 2006. Prevention and management of painful neuroma. Neurologia Medico-Chirurgica 46, 6267.

SL Llamas Moya , LA Boyle , PB Lynch , S Arkins 2008. Effect of surgical castration on the behavioural and acute phase responses of 5-day-old piglets. Applied Animal Behaviour Science 111, 133145.

G Manteuffel , B Puppe , PC Schon 2004. Vocalization of farm animals as a measure of welfare. Applied Animal Behaviour Science 88, 163182.

JN Marchant-Forde , DC Lay Jr, KA McMunn , HW Cheng , EA Pajor , RM Marchant-Forde 2009. Postnatal piglet husbandry practices and well-being: the effects of alternative techniques delivered separately. Journal of Animal Science 87, 14791492.

G Marx , T Horn , J Thielebein , B Knubel , E Von Borell 2003. Analysis of pain-related vocalization in young pigs. Journal of Sound and Vibration 266, 687698.

RN McCarthy , LB Jeffcott , IJ Clarke 1993. Preliminary studies on the use of plasma beta-endorphin in horses as an indicator of stress and pain. Journal of Equine Veterinary Science 13, 216219.

JJ McGlone , JM Hellman 1988. Local and general anesthetic effects on behavior and performance of two- and seven-week-old castrated and uncastrated piglets. Journal of Animal Science 66, 30493058.

RK Meagher 2009. Observer ratings: validity and value as a tool for animal welfare research. Applied Animal Behaviour Science 119, 114.

P Melendez , J Bartolome , LF Archbald , A Donovan 2003. The association between lameness, ovarian cysts and fertility in lactating dairy cows. Theriogenology 59, 927937.

DJ Mellor , KJ Stafford , SE Todd , TE Lowe , NG Gregory , RA Bruce , RN Ward 2002. A comparison of catecholamine and cortisol responses of young lambs and calves to painful husbandry procedures. Australian Veterinary Journal 80, 228233.

R Melzack , PD Wall 1965. Pain mechanisms – a new theory. Science 150, 971971.

E Merlot , AM Mounier , A Prunier 2011. Endocrine response of gilts to various common stressors: a comparison of indicators and methods of analysis. Physiology & Behavior 102, 259265.

JJ Mettam , LJ Oulton , CR McCrohan , LU Sneddon 2011. The efficacy of three types of analgesic drugs in reducing pain in the rainbow trout, Oncorhynchus mykiss. Applied Animal Behaviour Science 133, 265274.

V Molony , JE Kent 1997. Assessment of acute pain in farm animals using behavioral and physiological measurements. Journal of Animal Science 75, 266272.

V Molony , JE Kent , IS Robertson 1993. Behavioural responses of lambs of three ages in the first three hours after three methods of castration and tail docking. Research in Veterinary Science 55, 236245.

V Molony , JE Kent , IS Robertson 1995. Assessment of acute and chronic pain after different methods of castration of calves. Applied Animal Behaviour Science 46, 3348.

V Molony , JE Kent , IJ McKendrick 2002. Validation of a method for assessment of an acute pain in lambs. Applied Animal Behaviour Science 76, 215238.

V Molony , JE Kent , BD Hosie , MJ Graham 1997. Reduction in pain suffered by lambs at castration. Veterinary Journal 153, 205213.

JP Morisse , JP Cotte , D Huonnic 1995. Effect of dehorning on behaviour and plasma cortisol responses in young calves. Applied Animal Behaviour Science 43, 239247.

D Morton , P Griffiths 1985. Guidelines on the recognition of pain, distress and discomfort in experimental animals and an hypothesis for assessment. Veterinary Record 116, 431436.

N Mouttotou , FM Hatchell , LE Green 1999. Foot lesions in finishing pigs and their associations with the type of floor. Veterinary Record 144, 629632.

GJ Noonan , JS Rand , J Priest , J Ainscow , JK Blackshaw 1994. Behavioural observations of piglets undergoing tail docking, teeth clipping and ear notching. Applied Animal Behaviour Science 39, 203213.

DR Paull , C Lee , IG Colditz , AD Fisher 2009. Effects of a topical anaesthetic formulation and systemic carprofen, given singly or in combination, on the cortisol and behavioural responses of Merino lambs to castration. Australian Veterinary Journal 87, 230237.

Y Persson , L Soderquist , S Ekman 2007. Joint disorder: a contributory cause to reproductive failure in beef bulls? Acta Veterinaria Scandinavica 49, 31.

A Prunier , AM Mounier , M Hay 2005. Effects of castration, tooth resection, or tail docking on plasma metabolites and stress hormones in young pigs. Journal of Animal Science 83, 216222.

B Puppe , PC Schon , A Tuchscherer , G Manteuffel 2005. Castration-induced vocalisation in domestic piglets, Sus scrofa: complex and specific alterations of the vocal quality. Applied Animal Behaviour Science 95, 6778.

SC Reilly , JP Quinn , AR Cossins , LU Sneddon 2008. Behavioural analysis of a nociceptive event in fish: comparisons between three species demonstrate specific responses. Applied Animal Behaviour Science 114, 248259.

TR Rietmann , M Stauffacher , P Bernasconi , JA Auer , MA Weishaupt 2004. The association between heart rate, heart rate variability, endocrine and behavioural pain measures in horses suffering from laminitis. Journal of Veterinary Medicine Series A – Physiology Pathology Clinical Medicine 51, 218225.

K Ren , R Torres 2009. Role of interleukin-1β during pain and inflammation. Brain Research Reviews 60, 5764.

S Robert , BK Thompson , D Fraser 1995. Selective tooth clipping in the management of low-birth weight piglets. Canadian Journal of Animal Science 75, 285289.

IS Robertson , JE Kent , V Molony 1994. Effect of different methods of castration on behavior and plasma cortisol in calves of three ages. Research in Veterinary Science 56, 817.

J Rushen , E Pombourcq , AMD Passillé 2007. Validation of two measures of lameness in dairy cows. Applied Animal Behaviour Science 106, 173177.

KS Schwartzkopf-Genswein , JM Stookey , R Welford 1997. Behavior of cattle during hot-iron and freeze branding and the effects of subsequent handling ease. Journal of Animal Science 75, 20642072.

KS Schwartzkopf-Genswein , JM Stookey , TG Crowe , BM Genswein 1998. Comparison of image analysis, exertion force, and behavior measurements for use in the assessment of beef cattle responses to hot-iron and freeze branding. Journal of Animal Science 76, 972979.

HB Simonsen , L Klinken , E Bindseil 1991. Histopathology of intact and docked pigtails. British Veterinary Journal 147, 407412.

LU Sneddon 2003. The evidence for pain in fish: the use of morphine as an analgesic. Applied Animal Behaviour Science 83, 153162.

KJ Stafford , DJ Mellor 2005. Dehorning and disbudding distress and its alleviation in calves. The Veterinary Journal 169, 337349.

KJ Stafford , DJ Mellor , SE Todd , RA Bruce , RN Ward 2002. Effects of local anaesthesia or local anaesthesia plus a non-steroidal anti-inflammatory drug on the acute cortisol response of calves to five different methods of castration. Research in Veterinary Science 73, 6170.

M Stewart , KJ Stafford , SK Dowling , AL Schaefer , JR Webster 2008. Eye temperature and heart rate variability of calves disbudded with or without local anaesthetic. Physiology & Behavior 93, 789797.

M Stewart , GA Verkerk , KJ Stafford , AL Schaefer , JR Webster 2010. Noninvasive assessment of autonomic activity for evaluation of pain in calves, using surgical castration as a model. Journal of Dairy Science 93, 36023609.

SP Sylvester , DJ Mellor , KJ Stafford , RA Bruce , RN Ward 1998. Acute cortisol responses of calves to scoop dehorning using local anaesthesia and/or cautery of the wound. Australian Veterinary Journal 76, 118122.

PD Thornton , AE Waterman-Pearson 1999. Quantification of the pain and distress responses to castration in young lambs. Research in Veterinary Science 66, 107118.

AJ Tilbrook , AI Turner , IJ Clarke 2000. Effects of stress on reproduction in non-rodent mammals: the role of glucocorticoids and sex differences. Reviews of Reproduction 5, 105113.

STL Ting , B Earley , JML Hughes , MA Crowe 2003. Effect of ketoprofen, lidocaine local anesthesia, and combined xylazine and lidocaine caudal epidural anesthesia during castration of beef cattle on stress responses, immunity, growth, and behavior. Journal of Animal Science 81, 12811293.

S Torrey , N Devillers , M Lessard , C Farmer , T Widowski 2009. Effect of age on the behavioral and physiological responses of piglets to tail docking and ear notching. Journal of Animal Science 87, 17781786.

JF Turnbull , CE Adams , RH Richards , DA Robertson 1998. Attack site and resultant damage during aggressive encounters in Atlantic salmon (Salmo salar L.) parr. Aquaculture 159, 345353.

A Valros , S Ahlstrom , H Rintala , T Hakkinen , H Saloniemi 2004. The prevalence of tail damage in slaughter pigs in Finland and associations to carcass condemnations. Acta Agriculturae Scandinavica Section A – Animal Science 54, 213219.

I Veissier , J Rushen , D Colwell , AM De Passille 2000. A laser-based method for measuring the pain sensitivity of cattle. Applied Animal Behaviour Science 66, 289304.

KS Vestergaard , GS Sanotra 1999. Relationships between leg disorders and changes in the behaviour of broiler chickens. Veterinary Record 144, 205209.

E Von Borell , J Langbein , G Despres , S Hansen , C Leterrier , J Marchant-Forde , R Marchant-Forde , M Minero , E Mohr , A Prunier , D Valance , I Veissier 2007a. Heart rate variability as a measure of autonomic regulation of cardiac activity for assessing stress and welfare in farm animals – a review. Physiology & Behavior 92, 293316.

E Von Borell , H Dobson , A Prunier 2007b. Stress, behaviour and reproductive performance in female cattle and pigs. Hormones and Behavior 52, 130138.

JM Watts , JM Stookey 1999. Effects of restraint and branding on rates and acoustic parameters of vocalization in beef cattle. Applied Animal Behaviour Science 62, 125135.

JM Watts , JM Stookey 2000. Vocal behaviour in cattle: the animal's commentary on its biological processes and welfare. Applied Animal Behaviour Science 67, 1533.

DM Weary , LA Braithwaite , D Fraser 1998. Vocal response to pain in piglets. Applied Animal Behaviour Science 56, 161172.

CA Weeks , TD Danbury , HC Davies , P Hunt , SC Kestin 2000. The behaviour of chickens and its modification by lameness. Applied Animal Behaviour Science 67, 111125.

RG White , JA Deshazer , CJ Tressler , GM Borcher , S Davey , A Waninge , AM Parkhurst , MJ Milanuk , ET Clemens 1995. Vocalization and physiological response of pigs during castration with or without a local anesthetic. Journal of Animal Science 73, 381386.

A Wolff , E Vanduynhoven , M van Kleef , F Huygen , JE Pope , N Mekhail 2011. Phantom pain. Pain Practice 11, 403413.

LM Wylie , MJ Gentle 1998. Feeding-induced tonic pain suppression in the chicken: reversal by naloxone. Physiology and Behavior 64, 2730.

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