Daylength effects on stress and fear responses in broiler chickens

• Main Authors: Idrus, Zulkifli, Abdullah, Rasedee, O., Nor Syaadah, Mat Taib, Che Norma
• Format: Article
• Language: English
• Published: Asian-Australasian Association of Animal Production Societies 1998
• Online Access: http://psasir.upm.edu.my/id/eprint/50052/1/Daylength%20effects%20on%20stress%20and%20fear%20responses%20in%20broiler%20chickens.pdf; http://psasir.upm.edu.my/id/eprint/50052/; http://www.ajas.info/journal/view.php?number=19351

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...