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פותח על ידי קלירמאש פתרונות בע"מ -
Ventilation plays an important role in hens' egg production at high ambient temperature
Year:
2011
Source of publication :
Poultry Science
Authors :
יהב, שלמה
;
.
רוזל, מרק
;
.
שינדר, דמיטרי
;
.
Volume :
90
Co-Authors:
Ruzal, M., Institute of Animal Sciences, The Volcani Center, Bet Dagan 50250, Israel
Shinder, D., Institute of Animal Sciences, The Volcani Center, Bet Dagan 50250, Israel
Malka, I., Ministry of Agriculture, The Extension Service, Bet Dagan 50250, Israel
Yahav, S., Institute of Animal Sciences, The Volcani Center, Bet Dagan 50250, Israel
Facilitators :
From page:
856
To page:
862
(
Total pages:
7
)
Abstract:
Birds dissipate considerable heat through respiratory-evaporative and cutaneous-evaporative mechanisms and sensible heat loss (SHL) via radiation, convection, and conduction. The significance of SHL in laying hens is still to be confirmed. This study aimed to elucidate the effect of ventilation on egg production and quality during exposure to high ambient temperature. Lohman laying hens were raised outdoors up to age 35 wk, and 300 hens with similar egg production were divided among 5 treatments each comprising 4 replicates of 15 hens. Birds in 4 treatments were kept in computerized controlled-environment rooms acclimated to 35°C and 50% RH, with ventilation flow rates of 0.5, 1.5, 2.0, and 3.0 m/s, respectively, and those in the control were kept outdoors. Hens were acclimated to the controlled environment rooms for 1 wk and to the targeted environmental conditions for another week, and then were subjected to measurements for 2 wk. Egg production, mass, and shell density, and feed and water consumption were monitored. Body temperature, SHL, and plasma thyroid hormone concentrations were measured at the end of the experiment. The high environmental temperature impaired egg production and quality: whereas exposure of hens to ventilation flows of 2.0 and 3.0 m/s elicited significant recovery of these parameters with time, exposure to a rate of 0.5 m/s negatively affected these parameters throughout the experimental period. The highest feed intake and water consumption were observed in hens exposed to 2.0 and 3.0 m/s, respectively, and the highest SHL was observed in those exposed to 3.0 m/s. It can be concluded that ventilation rate significantly affected hens exposed to high ambient temperature: high ventilation (3.0 m/s) improved egg production whereas low ventilation (0.5 m/s) negatively affected production and quality. © 2011 Poultry Science Association Inc.
Note:
Related Files :
Air conditioning
Animal
animal housing
Animals
Blood
Chickens
Egg Shell
Female
Laying hen
standard
temperature
Ventilation
עוד תגיות
תוכן קשור
More details
DOI :
10.3382/ps.2010-00993
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
22662
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:53
Scientific Publication
Ventilation plays an important role in hens' egg production at high ambient temperature
90
Ruzal, M., Institute of Animal Sciences, The Volcani Center, Bet Dagan 50250, Israel
Shinder, D., Institute of Animal Sciences, The Volcani Center, Bet Dagan 50250, Israel
Malka, I., Ministry of Agriculture, The Extension Service, Bet Dagan 50250, Israel
Yahav, S., Institute of Animal Sciences, The Volcani Center, Bet Dagan 50250, Israel
Ventilation plays an important role in hens' egg production at high ambient temperature
Birds dissipate considerable heat through respiratory-evaporative and cutaneous-evaporative mechanisms and sensible heat loss (SHL) via radiation, convection, and conduction. The significance of SHL in laying hens is still to be confirmed. This study aimed to elucidate the effect of ventilation on egg production and quality during exposure to high ambient temperature. Lohman laying hens were raised outdoors up to age 35 wk, and 300 hens with similar egg production were divided among 5 treatments each comprising 4 replicates of 15 hens. Birds in 4 treatments were kept in computerized controlled-environment rooms acclimated to 35°C and 50% RH, with ventilation flow rates of 0.5, 1.5, 2.0, and 3.0 m/s, respectively, and those in the control were kept outdoors. Hens were acclimated to the controlled environment rooms for 1 wk and to the targeted environmental conditions for another week, and then were subjected to measurements for 2 wk. Egg production, mass, and shell density, and feed and water consumption were monitored. Body temperature, SHL, and plasma thyroid hormone concentrations were measured at the end of the experiment. The high environmental temperature impaired egg production and quality: whereas exposure of hens to ventilation flows of 2.0 and 3.0 m/s elicited significant recovery of these parameters with time, exposure to a rate of 0.5 m/s negatively affected these parameters throughout the experimental period. The highest feed intake and water consumption were observed in hens exposed to 2.0 and 3.0 m/s, respectively, and the highest SHL was observed in those exposed to 3.0 m/s. It can be concluded that ventilation rate significantly affected hens exposed to high ambient temperature: high ventilation (3.0 m/s) improved egg production whereas low ventilation (0.5 m/s) negatively affected production and quality. © 2011 Poultry Science Association Inc.
Scientific Publication
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