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Genetic Selection for Poultry Behaviour: Big Bad Wolf or Friend in Need?

Published online by Cambridge University Press:  11 January 2023

R B Jones  and
P M Hocking
R B Jones*
Affiliation:
Roslin Institute (Edinburgh), Roslin, Midlothian EH25 9PS, UK
P M Hocking
Affiliation:
Roslin Institute (Edinburgh), Roslin, Midlothian EH25 9PS, UK
*
† Contact for correspondence and reprint requests
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Abstract

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Although genetic selection for certain characteristics has compromised the well-being of domestic animals, selective breeding could and probably should be used to improve welfare. Three of the major behavioural problems facing the poultry industry are fear, feather pecking and social stress. However, these and many other behavioural traits respond readily to genetic selection. The present paper reports the results of selective breeding studies in which underlying fearfulness, sociality, feather pecking, adrenocortical responsiveness, and growth rate were manipulated in Japanese quail, Coturnix japonica, or in chickens, Gallus gallus domesticus. The apparent benefits of selection for appropriate levels of these characteristics are discussed, as are the ethical issues involved. The ultimate aims of the selection programmes and the studies described here are to improve the birds ‘ welfare and productivity by increasing their ability to interact successfully with their physical environment, with one another, and with human beings.

Keywords

animal welfarecorticosteronefearfeather peckinggenetic selectionsocial stress
Type
Research Article
Information
Animal Welfare , Volume 8 , Issue 4: Special Issue: Genetics and Animal Welfare , November 1999 , pp. 343 - 359
Copyright
© 1999 Universities Federation for Animal Welfare

References

Aggrey, S E and Cheng, K M 1994 Animal model analysis of genetic (Co) variances for growth traits in Japanese quail. Poultry Science 73: 1822–1828CrossRefGoogle ScholarPubMed
Appleby, M C 1998 Genetic engineering, welfare, and accountability. Journal of Applied Animal Welfare Science 1: 255–273Google ScholarPubMed
Appleby, M C, Hughes, B O and Elson, H A 1992 Poultry Production Systems, Behaviour, Management and Welfare. CAB International: Wallingford, UKGoogle Scholar
Barnett, J L, Hemsworth, P H, Hennessy, D P, McCallum, T H and Newman, E A 1994 The effects of modifying the amount of human contact on behavioural, physiological and production responses of laying hens. Applied Animal Behaviour Science 41: 87–100Google Scholar
Baumgartner, J 1994 Japanese quail production, breeding and genetics. World’s Poultry Science Journal 50: 227–235Google Scholar
Belyaev, D K 1979 Destabilizing selection as a factor in domestication. Journal of Heredity 70: 301–308CrossRefGoogle ScholarPubMed
Bessei, W 1979 Genetische aspekte der laufaktivitat bein huhn und bei der japanischen wachtel. In: Lachenmaier, F and Schlichting, M C (eds) Aktuelle Arbeiten zur Artgemassen Tierhaltung pp 141–152. KTBL: Darmstadt, GermanyGoogle Scholar
Bhagwat, A L and Craig, J V 1977 Selection for age at first egg: effect on social dominance. Poultry Science 56: 362–363CrossRefGoogle Scholar
Blokhuis, H J 1986 Feather pecking in poultry: its relations with ground pecking. Applied Animal Behaviour Science 16: 63–67CrossRefGoogle Scholar
Blokhuis, H J and Beutler, A 1992 Feather pecking damage and tonic immobility response in two lines of White Leghorn hens. Journal of Animal Science 70 (Suppl. 1): 170 (Abstract)Google Scholar
Blokhuis, H J and Beuving, G 1993 Feather pecking and other characteristics in two lines of laying hens. In: Savory, C J and Hughes, B O (eds) Proceedings of the 4th European Symposium on Poultry Welfare pp 266–267. Universities Federation for Animal Welfare: Potters Bar, UKGoogle Scholar
Broom, D M 1969 Effects of visual complexity during rearing on chicks’ reactions to environmental change. Animal Behaviour 17: 773–780CrossRefGoogle Scholar
Burns, M B, Domjan, M and Mills, A D 1998 Effects of genetic selection for fearfulness or social reinstatement behavior on adult social and sexual behavior in domestic quail (Coturnix japónica). Psychobiology 26: 249–257CrossRefGoogle Scholar
Burt, D W, Bumstead, N, Bitgood, J J, Ponce de Leon, F A and Crittenden, L B 1995 Chicken genome mapping: a new era in avian genetics. Trends in Genetics 11: 190–194CrossRefGoogle ScholarPubMed
Carmichael, N L, Jones, R B and Mills, A D 1998 Social preferences in Japanese quail chicks from lines selected for low or high social reinstatement motivation: effects of number and line identity of the stimulus birds. Applied Animal Behaviour Science 58: 353–363CrossRefGoogle Scholar
Clarke, C H and Jones, R B (in press) Effects of prior video stimulation on open-field behaviour in domestic chicks. Applied Animal Behaviour Science:Google Scholar
Collins, J W and Siegel, P B 1987 Human handling, flock size and responses to an E. coli challenge in young chickens. Applied Animal Behaviour Science 19: 183–188Google Scholar
Craig, J V, Craig, T P and Dayton, A D 1983 Fearful behavior by hens of two genetic stocks. Applied Animal Ethology 10: 263–273.Google Scholar
Craig, J V, Jan, M L, Polley, C R and Bhagwat, A L 1975 Changes in relative aggressiveness and social dominance associated with selection for early egg production in chickens. Poultry Science 54: 1647–1658CrossRefGoogle ScholarPubMed
Craig, J V and Muir, W M 1996a Group selection for adaptation to multiple-hen cages: beak-related mortality, feathering and body weight responses. Poultry Science 75: 294–302CrossRefGoogle ScholarPubMed
Craig, J V and Muir, W M 1996b Group selection for adaptation to multiple-hen cages: behavioural responses. Poultry Science 75: 1145–1155CrossRefGoogle Scholar
Craig, J V and Swanson, J C 1994 Welfare perspectives on hens kept for egg production. Poultry Science 73: 921–938CrossRefGoogle ScholarPubMed
Davison, T F and Powell, P C 1987 Corticosterone-induced immunosuppression and its importance in outbreaks of Marek’s disease in vaccinated chickens. British Poultry Science 28: 760–761Google Scholar
Denenberg, V H 1962 The effects of early experience. In: Hafez, ESE (ed) The Behaviour of Domestic Animals pp 109–138. Baillière, Tindall & Cox: London, UKGoogle Scholar
Eddy T J and Gallup G G Jr 1994 Passive socialization to humans: effects on tonic immobility in chickens (Gallus gallus). Animal Learning and Behavior 22: 325–331CrossRefGoogle Scholar
Faure, J M 1980 To adapt the environment to the bird or the bird to the environment ? In: Moss R (ed) The Laying Hen and its Environment pp 19–42. Martinus Nijhof: The Hague, The NetherlandsCrossRefGoogle Scholar
Faure, J M 1981 Bidirectional selection for open-field activity in young chicks. Behavior Genetics 11: 135–144CrossRefGoogle ScholarPubMed
Faure, J M and Mills, A D 1998 Improving the adaptability of animals by selection. In Grandin, T (ed) Genetics and the Behavior of Domestic Animals pp 235–264. Academic Press: San Diego, USAGoogle Scholar
Francois, N, Mills, A D and Faure, J M 1997 Inter-individual distances (IID) in Japanese quail Coturnix japónica selected for high or low levels of sociability. In: Koene, P and Blokhuis, H J (eds) Proceedings of the 5th European Symposium on Poultry Welfare pp 159–160. World’s Poultry Science Association: Wageningen, The NetherlandsGoogle Scholar
Francois, N, Mills, A D and Faure, J M 1998 Place preferences of Japanese quail given a permanent choice between a social or a non-social but enriched situation. Behavioural Processes 43: 163–17010.1016/S0376-6357(98)00010-2CrossRefGoogle ScholarPubMed
Gallup G G Jr 1974 Genetic influence on tonic immobility in chickens. Animal Learning and Behavior 2: 145–147CrossRefGoogle Scholar
Gentle, M J 1986 Beak trimming in poultry. World ‘s Poultry Science Journal 42: 268–275Google Scholar
Gentle, M J, Hughes, B O, Fox, A and Waddington, D 1997 Behavioural and anatomical consequences of two beak trimming methods in 1- and 10-d-old domestic chicks. British Poultry Science 38: 453–463CrossRefGoogle ScholarPubMed
Gerken, M, Bamberg, H and Petersen, J 1988 Studies of the relationship between fear-related responses and production traits in Japanese quail (Coturnix coturnix japónica) bidirectionally selected for dustbathing activity. Poultry Science 67: 1363–1371CrossRefGoogle Scholar
Gerken, M and Petersen, J 1987 Bidirectional selection for dustbathing activity in Japanese quail (Coturnix coturnix japónica). British Poultry Science 28: 23–37CrossRefGoogle Scholar
Gildersleeve, R P, Satterlee, D G, McRee, D I, Bryan, T E and Parkhurst, C R 1988 Plasma corticosterone in hemorrhaged Japanese quail after microwave irradiation in ovo. Comparative Biochemistry & Physiology 89A: 415–424CrossRefGoogle Scholar
Grandin, T 1994 Solving livestock handling problems. Veterinary Medicine 89: 989–998Google Scholar
Grandin, T and Deesing, M J 1998 Behavioral genetics and animal science. In: Grandin T (ed) Genetics and the Behavior of Domestic Animals pp 1 -30. Academic Press: San Diego, USACrossRefGoogle Scholar
Gvaryahy, G, Ararat, E, Asaf, E, Lev, M, Weiler, J L, Robinzon, B and Snapir, N 1994 An enrichment object that reduces aggressiveness and mortality in caged laying hens. Physiology & Behavior 55: 313316Google Scholar
Gvaryahu, G, Cunningham, D L and Van Tienhoven, A 1990 The effect of environmental enrichment on egg layers - final results of six experiments. In: Proceedings of the 28th Annual Convention, Worlds ‘ Poultry Science Association, Israel Branch p 75. Worlds’ Poultry Science Association, Israel Branch: Zichron Ya’akov, IsraelGoogle Scholar
Haley, L E, Abplanalp, H and Enya, K 1966 Selection for increased fertility of female quail when mated to male chickens. Evolution 20: 72–81CrossRefGoogle ScholarPubMed
Hemsworth, P H and Coleman, G J 1998 Human-Livestock Interactions. The Stockperson and the Productivity and Welfare of Intensively Farmed Animals. CAB International: Wallingford, UKGoogle Scholar
Hester, P Y, Muir, W M, Craig, J V and Albright, J L 1996a Group selection and adaptation to multiplehen cages: hematology and adrenal function. Poultry Science 75: 1295–1307CrossRefGoogle ScholarPubMed
Hester, P Y, Muir, W M, Craig, J V and Albright, J L 1996b Group selection and adaptation to multiplehen cages: production traits during heat and cold exposures. Poultry Science 75: 1308–1314CrossRefGoogle ScholarPubMed
Horst, P 1985 Effects of genotype χ environment interactions on efficiency of egg production. In: Hill, W G, Manson, J M and Hewitt, D (eds) Poultry Genetics and Breeding, Poultry Science Symposium Number 18 pp 147–156. Longman: Harlow, UKGoogle Scholar
Hughes, B O and Curtis, P E 1997 Health and disease. In: Appleby, M C and Hughes, B O (eds) Animal Welfare pp 109–125. CAB International: Wallingford, UKGoogle Scholar
Hughes, B O and Duncan, I J H 1972 The influence of strain and environmental factors upon feather pecking and cannibalism in fowls. British Poultry Science 13: 525–547CrossRefGoogle ScholarPubMed
Jones, R B 1993 Reduction of the domestic chick’s fear of humans by regular handling and related treatments. Animal Behaviour 46: 991–998CrossRefGoogle Scholar
Jones, R B 1995 Habituation to human beings via visual contact in docile and flighty strains of domestic chicks. International Journal of Comparative Psychology 8: 88–98CrossRefGoogle Scholar
Jones, R B 1996 Fear and adaptability in poultry: insights, implications and imperatives. World’s Poultry Science Journal 52: 131–174CrossRefGoogle Scholar
Jones, R B 1997 Fear and distress. In: Appleby, M C and Hughes, B O (eds) Animal Welfare pp 75–87. CAB International: Wallingford, UKGoogle Scholar
Jones, R B, Bessei, W and Faure, J M 1982 Aspects of ‘fear’ in Japanese quail chicks (Coturnix coturnix japónica) genetically selected for different levels of locomotor activity. Behavioural Processes 7: 201–210CrossRefGoogle ScholarPubMed
Jones, R B, Beuving, G and Blokhuis, H J 1988 Tonic immobility and heterophil/lymphocyte responses of the domestic fowl to corticosterone infusion. Physiology & Behavior 42: 249–253CrossRefGoogle ScholarPubMed
Jones, R B, Blokhuis, H J and Beuving, G 1995 Open-field and tonic immobility responses in domestic chicks of two genetic lines differing in their propensity to feather peck. British Poultry Science 36: 525–530CrossRefGoogle ScholarPubMed
Jones, R B, Hemsworth, P H and Barnett, J L 1993 Fear of humans and performance in commercial broiler flocks. In: Savory, C J and Hughes, B O (eds) Proceedings of the 4th European Symposium on Poultry Welfare pp 292–294. Universities Federation for Animal Welfare: Potters Bar, UKGoogle Scholar
Jones, R B and Hughes, B O 1986 Fearfulness and abnormalities in the chicken’s eggshell - is there a link? In: Czako J (ed) Proceedings of the International Symposium on Applied Ethology in Farm Animal pp 461–465. Hungarian Academy of Sciences: Budapest, HungaryGoogle Scholar
Jones, R B, Marin, R H, Garcia, D A and Arce, A 1999 T-maze behaviour in domestic chicks: A search for underlying variables. Animal Behaviour 58: 211–217CrossRefGoogle ScholarPubMed
Jones, R B, Mills, A D and Faure, J M 1991 Genetic and experiential manipulation of fear-related behavior in Japanese quail chicks (Coturnix coturnix japónica). Journal of Comparative Psychology 105: 15–24CrossRefGoogle ScholarPubMed
Jones, R B, Mills, A D and Faure, J M 1996 Social discrimination in Japanese quail Coturnix japónica chicks genetically selected for low or high social reinstatement motivation. Behavioural Processes 36: 117–124CrossRefGoogle ScholarPubMed
Jones, R B, Mills, A D, Faure, J M and Williams, J B 1994a Restraint, fear and distress in Japanese quail genetically selected for long or short tonic immobility reactions. Physiology & Behavior 56: 529–534CrossRefGoogle ScholarPubMed
Jones, R B and Satterlee, D G 1996 Threat-induced behavioural inhibition in Japanese quail genetically selected for contrasting adrenocortical response to mechanical restraint. British Poultry Science 37: 465470CrossRefGoogle ScholarPubMed
Jones, R B and Satterlee, D G 1997 Fear in aged quail divergently selected for adrenocortical responsiveness. In: Koene, P and Blokhuis, H J (eds) Proceedings of the 5th European Symposium on Poultry Welfare pp 161–162. World’s Poultry Science Association: Wageningen, The NetherlandsGoogle Scholar
Jones, R B, Satterlee, D G and Marks, H L 1997 Fear-related behaviour in Japanese quail divergently selected for body weight. Applied Animal Behaviour Science 52: 87–98CrossRefGoogle Scholar
Jones, R B, Satterlee, D G and Ryder, F H 1992a Fear and distress in Japanese quail chicks of two lines genetically selected for low or high adrenocortical response to immobilization stress. Hormones & Behavior 26: 385–393CrossRefGoogle ScholarPubMed
Jones, R B, Satterlee, D G and Ryder, F H 1992b Open-field behaviour of Japanese quail chicks genetically selected for low or high plasma corticosterone response to immobilization stress. Poultry Science 71: 1403–1407CrossRefGoogle ScholarPubMed
Jones, R B, Satterlee, D G and Ryder, F H 1994b Fear of humans in Japanese quail selected for low or high adrenocortical response. Physiology & Behavior 56: 379–383CrossRefGoogle ScholarPubMed
Jones, R B and Waddington, D 1992 Modification of fear in domestic chicks, Gallus gallus domesticus, via regular handling and early environmental enrichment. Animal Behaviour 43: 1021–1033CrossRefGoogle Scholar
Korte, S M, Beuving, G, Ruesink, W, Jones, R B and Blokhuis, H J 1997 Adrenal hormone release during manual restraint in domestic chicks from a high and low feather pecking line of laying hens. In: Koene, P and Blokhuis, H J (eds) Proceedings of the 5th European Symposium on Poultry Welfare pp 18–19. World’s Poultry Science Association: Wageningen, The NetherlandsGoogle Scholar
Launay, F 1993 Consequences Comportementales et Physiologiques de Selections pour l’Emotivite et l’Attraction Sociale chez la Caille Japonaise (Coturnix japónica). Unpublished PhD thesis, University of Rennes, France (No d’Ordre 1011)Google Scholar
Launay, F, Mills, A D and Faure, J M 1991 Social motivation in Japanese quail Coturnix coturnix japonica chicks selected for high or low levels of treadmill behaviour. Behavioural Processes 24: 95–110CrossRefGoogle ScholarPubMed
Launay, F, Mills, A D and Faure, J M 1993 Effect oftest age, line and sex on tonic immobility responses and social reinstatement behaviour in Japanese quails Coturnix japónica. Behavioural Processes 29: 116Google Scholar
Magnolon, S 1994 Etude de l’Attraction Sociale et de l’Aggressivite chez Deux Souches de Cailles Japonaises Sélectionnées pour leur Fort/Faible Motivation Sociale. Unpublished MSc thesis, DEA, University of Rennes, FranceGoogle Scholar
Manser, C E 1996 Effects of lighting on the welfare of domestic poultry: a review. Animal Welfare 5: 241–260CrossRefGoogle Scholar
Marin, R H, Arce, A and Martijena, I D 1997 T-maze performance and body weight relationship in broiler chicks. Applied Animal Behaviour Science 54: 197–205CrossRefGoogle Scholar
Marin, R H and Jones, R B 1999 Latency to traverse a T-maze at 2 days of age and later adrenocortical responses to an acute stressor in domestic chicks. Physiology & Behavior 66: 809–813CrossRefGoogle Scholar
Marin, R H, Jones, R B, Garcia, D A and Arce, A 1999 Early T-maze performance and subsequent growth in commercial broiler flocks. British Poultry Science 40: 434–438CrossRefGoogle ScholarPubMed
Marks, H L 1995 Divergent selection for growth in Japanese quail under split and complete nutritional environments. 8. Progress from generations 18 through 30 following change of selection criterion. Poultry Science 74: 237–246CrossRefGoogle ScholarPubMed
Mauldin, J M and Siegel, P B 1979 ‘Fear’, head shaking and production in five populations of caged chickens. British Poultry Science 20: 39–44Google Scholar
McBride, G, Parer, I P and Foenander, J M 1969 The social organization and behaviour of the ferai domestic fowl. Animal Behaviour Monographs 2: 125–181CrossRefGoogle Scholar
Mench, J A 1992 The welfare of poultry in modern production systems. Poultry Science Reviews 4: 107 128Google Scholar
Mills, A D and Faure, J M 1990 Panic and hysteria in domestic fowl: a review. In: Zayan, R and Dantzer, R (eds) Social Stress in Domestic Animals pp 248–272. Kluwer Academic Publishers: Dordrecht, The NetherlandsGoogle Scholar
Mills, A D and Faure, J M 1991 Divergent selection for duration of tonic immobility and social reinstatement behavior in Japanese quail chicks. Journal of Comparative Psychology 105: 25–38CrossRefGoogle Scholar
Mills, A D and Faure, J M 1992 The behaviour of domestic quail. In: Nichelmann, M (ed) Nutztierethologie pp 1–16. Gustav Fisher Verlag: Jena, GermanyGoogle Scholar
Mills, A D, Jones, R B and Faure, J M 1995 Species specificity of social reinstatement in Japanese quail Coturnix japónica genetically selected for high or low levels of social reinstatement behaviour. Behavioural Processes 34: 13–22CrossRefGoogle ScholarPubMed
Mills, A D, Jones, R B, Faure, J M and Williams, J B 1993 Responses to isolation in Japanese quail genetically selected for low or high sociality. Physiology & Behavior 53: 183–189CrossRefGoogle ScholarPubMed
Mills, A D, Nys, Y, Gautron, J and Zawadski, J 1991 Whitening of brown shelled eggs: individual variation and relationship with age, fearfulness, oviposition interval and stress. British Poultry Science 32: 117–129CrossRefGoogle Scholar
Muir, W 1996 Group selection for adaptation to multi-hen cages: selection program and direct responses. Poultry Science 75: 447–458CrossRefGoogle ScholarPubMed
Nicol, C J 1992 Effects of environmental enrichment and gentle handling on behaviour and fear responses of transported broilers. Applied Animal Behaviour Science 33: 367–380CrossRefGoogle Scholar
Noi, E, Cheng, K and Nichols, C 1996 Heritability and phenotypic correlations of behaviour and dominance rank of Japanese quail. Animal Behaviour 52: 813–820Google Scholar
Ott, R S 1996 Animal selection and breeding techniques that create diseased populations and compromise welfare. Journal of American Veterinary Medicine 208: 1969–1974Google ScholarPubMed
Ouart, M D and Adams, A W 1982 Effects of cage design and bird density on layers. 1. Productivity, feathering and nervousness. Poultry Science 61: 1606–1613CrossRefGoogle Scholar
Reed, H J, Wilkins, L J, Austin, S D and Gregory, N G 1993 The effect of environmental enrichment during rearing on fear reactions and depopulation trauma in adult caged hens. Applied Animal Behaviour Science 36: 39–46CrossRefGoogle Scholar
Satterlee, D G and Edens, F W 1987 Plasma catecholamine releases post-immobilization in Japanese quail high and low blood corticosterone response lines. Poultry Science 66 (Suppl. 1): 38-39 (Abstract)Google Scholar
Satterlee, D G and Johnson, W A 1985 Metabolic traits in Japanese quail selected for high or low corticosterone response to stress. Poultry Science 64 (Suppl. 1): 176 (Abstract)Google Scholar
Satterlee, D G and Johnson, W A 1988 Selection of Japanese quail for contrasting blood corticosterone response to immobilization. Poultry Science 67: 25–32CrossRefGoogle ScholarPubMed
Satterlee, D G and Jones, R B 1995 Timidity in Japanese quail divergently selected for low or high adrenocortical response to immobilization stress. Poultry Science 74 (Suppl. 1): 116 (Abstract)Google Scholar
Satterlee, D G and Roberts, E D 1990 The influence of stress treatment on femur cortical bone porosity and medullary bone status in Japanese quail selected for high and low blood corticosterone response to stress. Comparative Biochemistry and Physiology 95A: 401–405CrossRefGoogle Scholar
Schulkin, J, McEwen, B S and Gold, P W 1994 Allostasis, amygdala, and anticipatory angst. Neurosciences and Biobehavioral Reviews 18: 385–396CrossRefGoogle ScholarPubMed
Scott, T R, Satterlee, D G and Jacobs-Perry, L A 1983 Circulating corticosterone responses of food and water deprived broilers and Japanese quail. Poultry Science 62: 290–297CrossRefGoogle ScholarPubMed
Sefton, A E and Crober, D C 1976 Social and physical environmental influences on caged single comb White Leghorns. Canadian Journal of Animal Science 56: 733–738CrossRefGoogle Scholar
Siegel, P B 1979 Behaviour genetics in chickens: a review. World’s Poultry Science Journal 35: 9–19CrossRefGoogle Scholar
Siegel, P B 1993 Behavior-genetic analyses and poultry husbandry. Poultry Science 72: 1–6CrossRefGoogle Scholar
Tauson, R and Svensson, S A 1980 Influence of plumage condition on the hen’s feed requirement. Swedish Journal of Agricultural Research 19: 35–39Google Scholar
Taylor, C S 1976a Multibreed designs. 1. Variation between breeds. Animal Production 23: 133–144Google Scholar
Taylor, C S 1976b Miltibreed designs 2. Genetic variation within and between breeds. Animal Production 23: 145–154Google Scholar
Taylor, C S and Hnizdo, E 1987 Multibreed designs. 3. Inter-breed relationships. Animal Production 44: 39–53Google Scholar
Vestergaard, K S, Kruijt, J P and Hogan, J A 1993 Feather pecking and chronic fear in groups of red junglefowl: their relations to dustbathing, rearing environment and social status. Animal Behaviour 45: 1127–1140CrossRefGoogle Scholar
Wechsler, B, Huber-Eicher, B, Aerni, V, El-lethey, H and Jungi, T W 1998 Motivational and physiological aspects of feather pecking in laying hens. In: Veissier I and Boissy A (eds) Proceedings of the 32nd Congress of the International Society for Applied Ethology ρ 48 (Abstract). Institut National de la Recherche Agronomique: Clermont-Ferrand, FranceGoogle Scholar
Williams, J B, Etches, R J and Rsaza, J 1985 Induction of a pause in laying by corticosterone infusion or dietary alterations: effects on the reproductive system, food consumption and body weight. British Poultry Science 26: 25–34CrossRefGoogle ScholarPubMed
Zulkifli, I, Dunnignton, E A and Siegel, P B 1995 Age and psychogenic factors in response to food deprivation and refeeding in White Leghorn chickens. Archiv für Geßügelkunde 59: 175–181Google Scholar
Zulkifli, I and Siegel, P B 1995 Is there a positive side to stress? World’s Poultry Science Journal 51: 63–76CrossRefGoogle Scholar