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Measuring fearfulness of hens in commercial organic egg production

Published online by Cambridge University Press:  11 January 2023

L Hegelund  and
JT Sørensen
L Hegelund*
Affiliation:
Danish Institute of Agricultural Sciences (DIAS), Department of Animal Health, Welfare and Nutrition, PO Box 50, DK-8830 Tjele, Denmark
JT Sørensen
Affiliation:
Danish Institute of Agricultural Sciences (DIAS), Department of Animal Health, Welfare and Nutrition, PO Box 50, DK-8830 Tjele, Denmark
*
* Contact for correspondence and requests for reprints: lene.hegelund@agrsci.dk
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Abstract

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To evaluate agreement between flock-based fear tests used in welfare assessments of laying hens in commercial organic farms, three tests were applied in 27 flocks of layers. Tests were performed at 35 and 55 weeks of age and were based on the concepts of ‘novel object’, ‘sudden sound’ and two different measures of ‘approaching human’. In general, agreements between tests were poor. The two measures based on ‘approaching human’ had the highest agreement, while the agreement between all other flock-based tests were lower. There was low agreement between testing at age 35 and 55 weeks.

In order to evaluate the degree to which the flock-based fear tests reflect individual hens' underlying fearfulness; tonic immobility (TI) tests were also applied on individual hens in eight flocks. There was large individual variation in the duration of tonic immobility, but also significant difference between flocks regarding mean duration of immobilisation. However there was no statistically significant association between TI-tests and flock-based tests. These results emphasise the need for careful consideration of choice of test stimuli for flock-based fear tests, and indicate that the investigated flock-based fear tests do not reflect the individual hens' underlying fearfulness.

Keywords

animal welfarefear testflock evaluationlaying henstest stimuliTonic Immobility Test
Type
Research Article
Information
Animal Welfare , Volume 16 , Issue 2: Special Issue: Proceedings of the 3rd International Workshop on the Assessment of Animal Welfare at Farm and Group Level , May 2007 , pp. 169 - 171
Copyright
© 2007 Universities Federation for Animal Welfare

References

Gallup, GG, Cummings, WH and Nash, RF 1972 The experimenter as an independent variable in studies of animal hypnosis in chickens (Gallus gallus). Animal Behaviour 20: 166–169CrossRefGoogle ScholarPubMed
Hemsworth, PH 2004 Human animal interactions. In: Perry GC (ed) Welfare of the Laying Hen. Poultry Science Symposium Series, Vol 27 pp 329-343. CAB International: Wallingford, UKCrossRefGoogle Scholar
Hocking, PM, Channing, CE, Waddington, D and Jones, RB 2001 Age-related changes in fear, sociality and pecking behaviours in two strains of laying hen. British Poultry Science 42: 414–423CrossRefGoogle ScholarPubMed
Jones, RB 1977 Sex and strain differences in the open-field responses of the domestic chick. Applied Animal Ethology 3: 255–261CrossRefGoogle Scholar
Jones, RB 1982 Effects of Early Environmental Enrichment upon Open-Field Behaviour and Timidity in the Domestic Chick. Developmental Psychobiology 15(2): 105–111CrossRefGoogle ScholarPubMed
Jones, RB 1996 Fear and adaptability in poultry. World's Poultry Science Journal 52: 131–174CrossRefGoogle Scholar
Jones, RB and Faure, JM 1981 Tonic immobility (“righting time”) in laying hens housed in cages and pens. Applied Animal Ethology 7: 369–372CrossRefGoogle Scholar
Mahboub, HDH, Müller, J and von Borell, E 2004 Outdoor use, tonic immobility, heterophil/lymphocyte ratio and feather condition in free-range laying hens of different genotypes. British Poultry Science 45(6): 738-744CrossRefGoogle Scholar
Odén, K, Keeling, LJ and Algers, B 2002 Behaviour of laying hens in two types of aviary systems on 25 commercial farms in Sweden. British Poultry Science 43: 169–181CrossRefGoogle ScholarPubMed
Tauson, R, Wahlström, A and Abrahamsson, P 1999 Effect of Two Floor Housing Systems and Cages on Health, Production and Fear Responses in Layers. Journal of Applied Poultry Research 8: 152–159CrossRefGoogle Scholar