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Effect of light intensity on broiler behaviour and diurnal rhythms

By Aman Deep, Karen Schwean-Lardner, Trever G. Crowe, Bryan I. Fancher, Henry L. Classen

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Abstract

Light intensity manipulation is an important management tool affecting broiler behaviour and physiology but still there is a debate regarding the optimum level to be used in confinement barns. Two experiments were completed to study the impact of light intensity (1, 10, 20 and 40lx) on behaviour and diurnal rhythms of broilers raised to 35d of age. For each experiment, 950 Ross√óRoss 308 chicks were housed per room with replication of individual light intensity treatment in two environmentally controlled rooms. Within each large room, a small pen with 25 male and 25 female chicks was used for recording behaviour. Data were analyzed as a randomized complete block design with experiment acting as a block. All chicks were provided with 40lx intensity and 23h light until shifting to treatment light intensity and 17h daylength at 7d of age. For each replicate, behaviour was recorded for a 24h period, starting at 16 or 17d of age. At 23d of age, three birds per room were bled at the start, middle and end of light and dark periods for melatonin estimation using RIA. When summarized over the 24 and 17h observation periods, birds exposed to a light intensity of 1lx rested more (P=0.01) and preened (P

Publication Title Applied Animal Behaviour Science
Volume 136
Issue 1
Pages 50-56
ISBN/ISSN 0168-1591
DOI 10.1016/j.applanim.2011.11.002
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Tags
  1. Behavior and behavior mechanisms
  2. Light intensity
  3. Melatonin
  4. Music