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אסיף מאגר המחקר החקלאי
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Blood System Response of Chickens to Changes in Environmental Temperature
Year:
1997
Source of publication :
Poultry Science
Authors :
Hurvitz, Shmuel
;
.
Plavnik, Isaak
;
.
Straschnow, Amir
;
.
Yahav, Shlomo
;
.
Volume :
76
Co-Authors:
Yahav, S., Institute of Animal Science, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Straschnow, A., Institute of Animal Science, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Plavnik, I., Institute of Animal Science, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Hurwitz, S., Institute of Animal Science, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Facilitators :
From page:
627
To page:
633
(
Total pages:
7
)
Abstract:
Hemodynamic changes were studied in broiler chickens during exposure to constant temperatures (10 to 35 C) or diurnal temperature cycles (10:30 C and 15:35 C), and during acute heat or cold. Packed cell volume (PCV) was significantly high at low constant temperatures (10 and 15 C), whereas at high temperatures (30 and 35 C) plasma volume (PV) was significantly high. A linear relationship between hematocrit and heart weight was observed and indicates an adaptation of heart mass to changes in cardiac output and hematocrit to meet the demands of increased basal metabolic rate. Only during the diurnal temperature cycle of 15:35 C did a significant increase in PV occur when ambient temperature (Ta) was raised from 15 to 35 C. Acute exposure of chickens to high temperature did not affect PV or PCV, but resulted in hyperthermia (44.7 ± 0.4 C). Changes in PCV are probably related to modulation of the supply of oxygen to accommodate changes in heat production. The significant hypervolemia observed at high temperatures could occur to provide the fluid needed for heat dissipation by panting. The lack of response of the blood system to acute temperature changes may be at least partially responsible for the chickens' failure to control body temperature.
Note:
Related Files :
Ambient temperature
Animal
Animals
blood volume
Histology
Male
Packed cell volume
temperature
Show More
Related Content
More details
DOI :
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
29573
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:47
Scientific Publication
Blood System Response of Chickens to Changes in Environmental Temperature
76
Yahav, S., Institute of Animal Science, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Straschnow, A., Institute of Animal Science, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Plavnik, I., Institute of Animal Science, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Hurwitz, S., Institute of Animal Science, ARO, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Blood System Response of Chickens to Changes in Environmental Temperature
Hemodynamic changes were studied in broiler chickens during exposure to constant temperatures (10 to 35 C) or diurnal temperature cycles (10:30 C and 15:35 C), and during acute heat or cold. Packed cell volume (PCV) was significantly high at low constant temperatures (10 and 15 C), whereas at high temperatures (30 and 35 C) plasma volume (PV) was significantly high. A linear relationship between hematocrit and heart weight was observed and indicates an adaptation of heart mass to changes in cardiac output and hematocrit to meet the demands of increased basal metabolic rate. Only during the diurnal temperature cycle of 15:35 C did a significant increase in PV occur when ambient temperature (Ta) was raised from 15 to 35 C. Acute exposure of chickens to high temperature did not affect PV or PCV, but resulted in hyperthermia (44.7 ± 0.4 C). Changes in PCV are probably related to modulation of the supply of oxygen to accommodate changes in heat production. The significant hypervolemia observed at high temperatures could occur to provide the fluid needed for heat dissipation by panting. The lack of response of the blood system to acute temperature changes may be at least partially responsible for the chickens' failure to control body temperature.
Scientific Publication
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