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Daylength Effects on Stress and Fear Responses in Broiler Chickens

  • Zulkifli, I. (Faculty of Veterinary Medicine and Animal Science, Universiti Putra Malaysia) ;
  • Rasedee, A. (Faculty of Veterinary Medicine and Animal Science, Universiti Putra Malaysia) ;
  • Nor Syaadah, O. (Faculty of Veterinary Medicine and Animal Science, Universiti Putra Malaysia) ;
  • Che Norma, M.T. (Faculty of Veterinary Medicine and Animal Science, Universiti Putra Malaysia)
  • Received : 1997.12.20
  • Accepted : 1998.05.26
  • Published : 1998.12.01

Abstract

Heterophil (H) to lymphocyte (L) ratios and durations of tonic immobility (TI) were measured to assess stress and fear responses, respectively, in broiler chickens provided either 12 h of natural lighting (12L) or 12 h natural lighting and 12 h of supplementary lighting (24L). Birds illuminated 24L had greater H/L ratios and TI durations than their 12L counterparts. Neither age, sex nor cage level had significant effect on TI reactions.

Keywords

Broilers;Daylength;Stress;Fear

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