The effect of light and darkness on acclimatization of laying hens
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 du...
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| Format: | Article |
| Language: | English English |
| Published: |
Asian-Australasian Association of Animal Production Societies
2000
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| Online Access: | http://psasir.upm.edu.my/id/eprint/50060/1/The%20effect%20of%20light%20and%20darkness%20on%20acclimatization%20of%20laying%20hens.pdf http://psasir.upm.edu.my/id/eprint/50060/7/50060.pdf |
| _version_ | 1825930258014011392 |
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| author | Ismail, Izzeldin Babiker Hamid, Kassim |
| author_facet | Ismail, Izzeldin Babiker Hamid, Kassim |
| author_sort | Ismail, Izzeldin Babiker |
| collection | UPM |
| description | 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. |
| first_indexed | 2024-03-06T09:08:51Z |
| format | Article |
| id | upm.eprints-50060 |
| institution | Universiti Putra Malaysia |
| language | English English |
| last_indexed | 2024-12-09T02:16:06Z |
| publishDate | 2000 |
| publisher | Asian-Australasian Association of Animal Production Societies |
| record_format | dspace |
| spelling | upm.eprints-500602024-10-15T06:55:32Z http://psasir.upm.edu.my/id/eprint/50060/ The effect of light and darkness on acclimatization of laying hens Ismail, Izzeldin Babiker Hamid, Kassim 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. Asian-Australasian Association of Animal Production Societies 2000 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/50060/1/The%20effect%20of%20light%20and%20darkness%20on%20acclimatization%20of%20laying%20hens.pdf text en http://psasir.upm.edu.my/id/eprint/50060/7/50060.pdf 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; eISSN: 1976-5517 http://www.ajas.info/journal/view.php?number=19635 10.5713/ajas.2000.694 |
| spellingShingle | Ismail, Izzeldin Babiker Hamid, Kassim The effect of light and darkness on acclimatization of laying hens |
| title | The effect of light and darkness on acclimatization of laying hens |
| title_full | The effect of light and darkness on acclimatization of laying hens |
| title_fullStr | The effect of light and darkness on acclimatization of laying hens |
| title_full_unstemmed | The effect of light and darkness on acclimatization of laying hens |
| title_short | The effect of light and darkness on acclimatization of laying hens |
| title_sort | effect of light and darkness on acclimatization of laying hens |
| url | http://psasir.upm.edu.my/id/eprint/50060/1/The%20effect%20of%20light%20and%20darkness%20on%20acclimatization%20of%20laying%20hens.pdf http://psasir.upm.edu.my/id/eprint/50060/7/50060.pdf |
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