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Daylength Effects on Stress and Fear Responses in Broiler Chickens |
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I. Zulkifli, A. Rasedee, O. Nor Syaadoh, M. T. Che Norma |
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| Abstract |
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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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