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פותח על ידי קלירמאש פתרונות בע"מ -
Thermoregulatory responses of chicks (Gallus domesticus) to low ambient temperatures at an early age
Year:
2007
Source of publication :
Poultry Science
Authors :
דרוין, שלי
;
.
טנאי, יוסף
;
.
יהב, שלמה
;
.
רוסל, מארק
;
.
שינדר, דמיטרי
;
.
Volume :
86
Co-Authors:
Shinder, D., Institute of Animal Science, Volcani Center, Bet Dagan 50250, Israel
Rusal, M., Institute of Animal Science, Volcani Center, Bet Dagan 50250, Israel
Tanny, J., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Druyan, S., Hebrew University of Jerusalem, Faculty of Agricultural, Food and Environmental Quality Sciences, Rehovot 76100, Israel
Yahav, S., Institute of Animal Science, Volcani Center, Bet Dagan 50250, Israel
Facilitators :
From page:
2200
To page:
2209
(
Total pages:
10
)
Abstract:
The potential to induce improved thermotolerance in broiler chickens is of great importance. Thermal conditioning is one of the management tools used to improve thermotolerance, enabling broilers to cope with extreme environmental conditions. This study investigated the effects of exposing chicks to low ambient temperature (Ta) on-chick body (Tb), surface (Ts) temperatures and total sensible heat loss (SHL) by convection and radiation from the body and from 2 main radiative organs, the face and the legs. At 3, 4, or at both 3 and 4 d of age, chicks were exposed to 5°C for 1.5 h a day (to avoid mortality) or to 10 or 15°C for 3 h a day. In general, in all treatments, the results during exposure to cold differed significantly from the control. A second cold exposure (on d 4 after a first exposure on d 3) clearly enhanced the chicks' ability to maintain on-chick body surface temperatures during exposure to 15°C and to recover much faster from cold exposure. A dramatic decline in average surface temperature was observed during the first 15 min of chicks' exposure to the various low ambient temperatures in all ages, reaching the lowest values in the 5°C treated chicks. The face responded immediately to cold exposure by significantly increasing its SHL to a level that then remained relatively steady (15°C) or declined moderately with time (10 and 5°C). In the legs, however, a significant and continuous decline in SHL was exhibited in all ages. The dynamics of SHL from the legs differed from that from the face, suggesting that the legs are a major organ for vasomotor responses, whereas the face is a more conservative vasoregulatory organ. It is concluded that repetitive exposure to cold may enhance thermotolerance, and that this is partially related to the vasomotor responses. This is the first report quantifying the differentiation between the legs as a responsive vasomotor organ and the face as a conservative vasomotor one. ©2007 Poultry Science Association Inc.
Note:
Related Files :
aging
Animal
Animals
body temperature
Chickens
Cold
Cold exposure
controlled clinical trial
Male
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
18806
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:24
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Scientific Publication
Thermoregulatory responses of chicks (Gallus domesticus) to low ambient temperatures at an early age
86
Shinder, D., Institute of Animal Science, Volcani Center, Bet Dagan 50250, Israel
Rusal, M., Institute of Animal Science, Volcani Center, Bet Dagan 50250, Israel
Tanny, J., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Druyan, S., Hebrew University of Jerusalem, Faculty of Agricultural, Food and Environmental Quality Sciences, Rehovot 76100, Israel
Yahav, S., Institute of Animal Science, Volcani Center, Bet Dagan 50250, Israel
Thermoregulatory responses of chicks (Gallus domesticus) to low ambient temperatures at an early age
The potential to induce improved thermotolerance in broiler chickens is of great importance. Thermal conditioning is one of the management tools used to improve thermotolerance, enabling broilers to cope with extreme environmental conditions. This study investigated the effects of exposing chicks to low ambient temperature (Ta) on-chick body (Tb), surface (Ts) temperatures and total sensible heat loss (SHL) by convection and radiation from the body and from 2 main radiative organs, the face and the legs. At 3, 4, or at both 3 and 4 d of age, chicks were exposed to 5°C for 1.5 h a day (to avoid mortality) or to 10 or 15°C for 3 h a day. In general, in all treatments, the results during exposure to cold differed significantly from the control. A second cold exposure (on d 4 after a first exposure on d 3) clearly enhanced the chicks' ability to maintain on-chick body surface temperatures during exposure to 15°C and to recover much faster from cold exposure. A dramatic decline in average surface temperature was observed during the first 15 min of chicks' exposure to the various low ambient temperatures in all ages, reaching the lowest values in the 5°C treated chicks. The face responded immediately to cold exposure by significantly increasing its SHL to a level that then remained relatively steady (15°C) or declined moderately with time (10 and 5°C). In the legs, however, a significant and continuous decline in SHL was exhibited in all ages. The dynamics of SHL from the legs differed from that from the face, suggesting that the legs are a major organ for vasomotor responses, whereas the face is a more conservative vasoregulatory organ. It is concluded that repetitive exposure to cold may enhance thermotolerance, and that this is partially related to the vasomotor responses. This is the first report quantifying the differentiation between the legs as a responsive vasomotor organ and the face as a conservative vasomotor one. ©2007 Poultry Science Association Inc.
Scientific Publication
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