PMID- 11201448
OWN - NLM
STAT- MEDLINE
DCOM- 20010405
LR  - 20081121
IS  - 0007-1668 (Print)
IS  - 0007-1668 (Linking)
VI  - 41
IP  - 5
DP  - 2000 Dec
TI  - Lack of response of laying hens to relative humidity at high ambient temperature.
PG  - 660-3
AB  - 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 
      degrees C (control) for 3 weeks and thereafter acclimated for 1 week to 35 
      degrees 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.
FAU - Yahav, S
AU  - Yahav S
AD  - Instute of Animal Science, ARO, Bet Dagan, Israel. vlyahav@agri.gov.il
FAU - Shinder, D
AU  - Shinder D
FAU - Razpakovski, V
AU  - Razpakovski V
FAU - Rusal, M
AU  - Rusal M
FAU - Bar, A
AU  - Bar A
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - England
TA  - Br Poult Sci
JT  - British poultry science
JID - 15740290R
SB  - IM
MH  - Age Factors
MH  - Animals
MH  - Body Weight
MH  - Chickens/*physiology
MH  - Eating
MH  - Egg Shell/chemistry/physiology
MH  - Eggs
MH  - Female
MH  - Hot Temperature/*adverse effects
MH  - Humidity/*adverse effects
MH  - Oviposition/*physiology
EDAT- 2001/02/24 12:00
MHDA- 2001/04/06 10:01
CRDT- 2001/02/24 12:00
PHST- 2001/02/24 12:00 [pubmed]
PHST- 2001/04/06 10:01 [medline]
PHST- 2001/02/24 12:00 [entrez]
AID - 10.1080/713654988 [doi]
PST - ppublish
SO  - Br Poult Sci. 2000 Dec;41(5):660-3. doi: 10.1080/713654988.