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אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Ventilation, sensible heat loss, broiler energy, and water balance under harsh environmental conditions
Year:
2004
Source of publication :
Poultry Science
Authors :
טנאי, יוסף
;
.
יהב, שלמה
;
.
כהן, שבתאי
;
.
לוגר, דרור
;
.
סטרשנוב, עמיר
;
.
שינדר, דמיטרי
;
.
Volume :
83
Co-Authors:
Yahav, S., Institute of Animal Science, Volcani Center, Bet Dagan 50250, Israel
Straschnow, A., Institute of Animal Science, Volcani Center, Bet Dagan 50250, Israel
Luger, D., Institute of Animal Science, Volcani Center, Bet Dagan 50250, Israel
Shinder, D., Institute of Animal Science, Volcani Center, Bet Dagan 50250, Israel
Tanny, J., Inst. Soil Water and Environ. Sci., ARO, Volcani Center, Bet Dagan 50250, Israel
Cohen, S., Inst. Soil Water and Environ. Sci., ARO, Volcani Center, Bet Dagan 50250, Israel
Facilitators :
From page:
253
To page:
258
(
Total pages:
6
)
Abstract:
Air velocity (AV) is one of the main environmental factors involved in thermoregulation, especially at high ambient temperatures. To elucidate the effect of AV on performance and thermoregulation of 4- to 7-wk-old broiler chickens, an experiment was conducted using 4 different AV (0.8, 1.5, 2.0, and 3.0 m/s) at constant ambient temperatature (35 ± 1.0°C) and RH (60 ± 2.5%). BW, feed intake, and fecal and urinary excretions were monitored in individuals and were used to calculate the amount of energy expended for maintenance. Infrared thermal imaging radiometry was used to measure surface temperatures for the calculation of heat loss by radiation and convection. Brachial vein blood was collected for plasma osmolality and arginine vasotocin analysis. Broilers performed optimally at an AV of 2.0 m/s. Energy expenditure for maintenance was significantly higher under these conditions, suggesting the ability to direct a sufficient amount of energy to control body temperature, while maintaining relatively high growth rates. Convective heat loss increased significantly with increasing AV, whereas radiative heat loss was not affected. Sensible heat loss, expressed as a percentage of energy expenditure for maintenance, was significantly higher at 2.0 m/s compared with 0.8 m/s but significantly lower than that of 3.0 m/s. The high level of heat loss observed at 3.0 m/s probably affected body water balance, as supported by significantly higher plasma osmolality, arginine vasotocin concentration, and the hyperthermic status of these birds. It can be concluded that AV of 2.0 m/s enables broilers to maintain proper performance together with efficient thermoregulation and water balance under harsh environmental conditions.
Note:
Related Files :
Air Movements
Animal
animal housing
Animals
Blood
Growth, Development and Aging
Male
metabolism
water
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
19941
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:32
Scientific Publication
Ventilation, sensible heat loss, broiler energy, and water balance under harsh environmental conditions
83
Yahav, S., Institute of Animal Science, Volcani Center, Bet Dagan 50250, Israel
Straschnow, A., Institute of Animal Science, Volcani Center, Bet Dagan 50250, Israel
Luger, D., Institute of Animal Science, Volcani Center, Bet Dagan 50250, Israel
Shinder, D., Institute of Animal Science, Volcani Center, Bet Dagan 50250, Israel
Tanny, J., Inst. Soil Water and Environ. Sci., ARO, Volcani Center, Bet Dagan 50250, Israel
Cohen, S., Inst. Soil Water and Environ. Sci., ARO, Volcani Center, Bet Dagan 50250, Israel
Ventilation, sensible heat loss, broiler energy, and water balance under harsh environmental conditions
Air velocity (AV) is one of the main environmental factors involved in thermoregulation, especially at high ambient temperatures. To elucidate the effect of AV on performance and thermoregulation of 4- to 7-wk-old broiler chickens, an experiment was conducted using 4 different AV (0.8, 1.5, 2.0, and 3.0 m/s) at constant ambient temperatature (35 ± 1.0°C) and RH (60 ± 2.5%). BW, feed intake, and fecal and urinary excretions were monitored in individuals and were used to calculate the amount of energy expended for maintenance. Infrared thermal imaging radiometry was used to measure surface temperatures for the calculation of heat loss by radiation and convection. Brachial vein blood was collected for plasma osmolality and arginine vasotocin analysis. Broilers performed optimally at an AV of 2.0 m/s. Energy expenditure for maintenance was significantly higher under these conditions, suggesting the ability to direct a sufficient amount of energy to control body temperature, while maintaining relatively high growth rates. Convective heat loss increased significantly with increasing AV, whereas radiative heat loss was not affected. Sensible heat loss, expressed as a percentage of energy expenditure for maintenance, was significantly higher at 2.0 m/s compared with 0.8 m/s but significantly lower than that of 3.0 m/s. The high level of heat loss observed at 3.0 m/s probably affected body water balance, as supported by significantly higher plasma osmolality, arginine vasotocin concentration, and the hyperthermic status of these birds. It can be concluded that AV of 2.0 m/s enables broilers to maintain proper performance together with efficient thermoregulation and water balance under harsh environmental conditions.
Scientific Publication
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