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Modification of aviary design reduces incidence of falls, collisions and keel bone damage in laying hens

By A. Stratmann, E. K. F. Frohlich, S. G. Gebhardt-Henrich, A. Harlander-Matauschek, H. Wurbel, M. J. Toscano

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Abstract

Non-cage housing systems for laying hens such as aviaries provide greater freedom to perform species-specific behavior and thus are thought to improve welfare of the birds; however, aviaries are associated with a high prevalence of keel bone damage (fractures and deviations), which is a major welfare problem in commercial laying hens. Potential causes of keel bone damage are falls and collisions with internal housing structures that occur as birds move between tiers or perches in the aviary. The aim of this study was to investigate the scope for reducing keel bone damage by reducing falls and collisions through modifications of aviary design. Birds were kept in 20 pens in a laying hen house (225 hens per pen) that were assigned to four different treatments ( n=5 pens per treatment group) including (1) control pens and pens modified by the addition of (2) perches, (3) platforms and (4) ramps. Video recordings at 19, 22, 29, 36 and 43 weeks of age were used to analyze controlled movements and falls (including details on occurrence of collision, cause of fall, height of fall and behavior after fall) during the transitional dusk and subsequent dark phase. Palpation assessments (focusing on fractures and deviations) using 20 focal hens per pen were conducted at 18, 20, 23, 30, 37, 44, 52 and 60 weeks of age. In comparison to the control group, we found 44% more controlled movements in the ramp ( P=0.003) and 47% more controlled movements in the platform treatments ( P=0.014) as well as 45% fewer falls ( P=0.006) and 59% fewer collisions ( P

Publication Title Applied Animal Behaviour Science
Volume 165
Pages 112-123
ISBN/ISSN 0168-1591
Language English
Author Address Research Centre for Proper Housing: Poultry and Rabbits (ZTHZ), Division of Animal Welfare, VPH Institute, University of Bern, Burgerweg 22, CH-3052 Zollikofen, Switzerland.arianestratmann@gmail.com
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Tags
  1. Animal behavior
  2. Animal housing
  3. Animals
  4. Aviaries
  5. Birds
  6. Bones
  7. Egg production
  8. Fowls
  9. Fractures
  10. Hens
  11. Incidence
  12. Locomotion
  13. modification
  14. palpation
  15. peer-reviewed
  16. pens
  17. Poultry
  18. sternum
  19. vertebrates
  20. video recordings
Badges
  1. peer-reviewed