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Lack of response of laying hens to relative humidity at high ambient temperature
Year:
2000
Source of publication :
British Poultry Science
Authors :
Bär, Arie
;
.
Razaphkovsky, V.
;
.
Rusal, Mark
;
.
Shinder, Dmitry A.
;
.
Yahav, Shlomo
;
.
Volume :
41
Co-Authors:
Yahav, S., Institute of Animal Science, ARO, Bet Dagan, Israel, Institute of Animal Science, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Shinder, D., Institute of Animal Science, ARO, Bet Dagan, Israel
Razpakovski, V., Institute of Animal Science, ARO, Bet Dagan, Israel
Rusal, M., Institute of Animal Science, ARO, Bet Dagan, Israel
Bar, A., Institute of Animal Science, ARO, Bet Dagan, Israel
Facilitators :
From page:
660
To page:
663
(
Total pages:
4
)
Abstract:
1. The effects of relative humidity (rh=40% to 70%) at high ambient temperature (Ta) on the performance of laying hens at different ages (8 to 10 months, Trial 1; and 16 to 18 months, Trial 2) was evaluated. Laying hens were exposed to 25°C (control) for 3 weeks and thereafter acclimated for 1 week to 35°C and 4 different rh. 2. Body weight declined significantly in young and older hens exposed to 60% or 70% and 70% rh, respectively. Food intake declined with increasing Ta, except in the case of older hens exposed to 60% rh, for which it remained relatively constant. Water consumption, however, increased with increasing Ta but the increase was significant in young hens exposed to 70% rh only. 3. Egg production was not affected by the changes in Ta. However, a decrease in egg production was observed in older hens exposed to 60% rh. 4. Egg weight (EW), shell weight (SW) and shell thickness (ST) were significantly reduced by exposure to elevated Ta, whereas % breakage significantly increased. In young hens, a response to rh was exhibited in ST which was significantly higher in hens exposed to the low rh (40% to 45%) than in those exposed to the highest rh (70% to 75%). 5. It can be concluded that Ta is the main environmental factor affecting young and older laying hens while the effect of rh is minor. © 2000, British Poultry Science Ltd.
Note:
Related Files :
Age Factors
Animal
Animals
article
body weight
chemistry
chicken
Chickens
eating
egg
Egg Shell
Female
humidity
Show More
Related Content
More details
DOI :
10.1080/0007166002000921 6
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
22595
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:53
Scientific Publication
Lack of response of laying hens to relative humidity at high ambient temperature
41
Yahav, S., Institute of Animal Science, ARO, Bet Dagan, Israel, Institute of Animal Science, Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Shinder, D., Institute of Animal Science, ARO, Bet Dagan, Israel
Razpakovski, V., Institute of Animal Science, ARO, Bet Dagan, Israel
Rusal, M., Institute of Animal Science, ARO, Bet Dagan, Israel
Bar, A., Institute of Animal Science, ARO, Bet Dagan, Israel
Lack of response of laying hens to relative humidity at high ambient temperature
1. The effects of relative humidity (rh=40% to 70%) at high ambient temperature (Ta) on the performance of laying hens at different ages (8 to 10 months, Trial 1; and 16 to 18 months, Trial 2) was evaluated. Laying hens were exposed to 25°C (control) for 3 weeks and thereafter acclimated for 1 week to 35°C and 4 different rh. 2. Body weight declined significantly in young and older hens exposed to 60% or 70% and 70% rh, respectively. Food intake declined with increasing Ta, except in the case of older hens exposed to 60% rh, for which it remained relatively constant. Water consumption, however, increased with increasing Ta but the increase was significant in young hens exposed to 70% rh only. 3. Egg production was not affected by the changes in Ta. However, a decrease in egg production was observed in older hens exposed to 60% rh. 4. Egg weight (EW), shell weight (SW) and shell thickness (ST) were significantly reduced by exposure to elevated Ta, whereas % breakage significantly increased. In young hens, a response to rh was exhibited in ST which was significantly higher in hens exposed to the low rh (40% to 45%) than in those exposed to the highest rh (70% to 75%). 5. It can be concluded that Ta is the main environmental factor affecting young and older laying hens while the effect of rh is minor. © 2000, British Poultry Science Ltd.
Scientific Publication
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