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The effect of light and darkness on acclimatization of laying hens


Ismail, Izzeldin Babiker and Hamid, Kassim (2000) The effect of light and darkness on acclimatization of laying hens. Asian-Australasian Journal of Animal Sciences, 13 (5). pp. 694-697. ISSN 1011-2367; ESSN: 1976-5517


Laying hens kept in different light and dark periods of the day at high ambient temperature of maximum 35°C were challenged to 38.5±0.5°C acute heat 3 hours daily for 7 consecutive days. They were found to have a significant (p<0.01) acclimatization response (rectal temperature) to heat stress during the dark period compared to those exposed to the same temperature during the light period. The blood pH was not significantly different. The partial pressure of carbon dioxide (PCO2) was significantly high (p<0.01) except in day 4. Similarly the blood bicarbonate (HCO3-) concentration was significantly high (p<0.05) except day three and day four. Acute heat exposure in the first day increased the body temperature in both groups (Light and Dark) reaching 44°C, followed by gradual reduction in body temperature. The dark treated birds showed rapid reduction in body temperature (42.88°C) and adaptation to high temperature during days 2-4 but that this was lost to some extent in days 6-8. However this was not obvious in the light treated birds. It is concluded that darkness reduce hyperthermia and enhance acclimatization responses during acute heat stress.

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Official URL or Download Paper: http://www.ajas.info/journal/view.php?number=19635

Additional Metadata

Item Type: Article
Divisions: Faculty of Veterinary Medicine
DOI Number: https://doi.org/10.5713/ajas.2000.694
Publisher: Asian-Australasian Association of Animal Production Societies
Keywords: Acclimatization; Darkness; Heat stress; Hyperthermia; Light
Depositing User: Nabilah Mustapa
Date Deposited: 30 Dec 2016 06:03
Last Modified: 30 Dec 2016 06:03
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.5713/ajas.2000.694
URI: http://psasir.upm.edu.my/id/eprint/50060
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