Thermotolerance acquisition in broiler chickens through early feed restriction: response to acute heat stress

Abioja M. O, . and Akerele Z., . and Ogundele O., . and Oke H., . and Kasali O. D., . and Abiona J. A., . and Sodipe O. G., . and Osinowo O. A., . and Ola A., . and Oladipo K. A., . Thermotolerance acquisition in broiler chickens through early feed restriction: response to acute heat stress. pp. 311-319.

Broiler chicks were subjected to early feed restriction (EFR) on d3-5 post-hatch to determine the day that confers the best thermal tolerance during acute heat stress episode at market age. In Experiment I 160 Marshall chicks were allotted to 4 treatments. One group received feed ad libitum (CONTROL) while others received no feed for a period of 24 hours on d3 (D3) d4 (D4) and d5 (D5) respectively. Each group had 4 replicates with a total of 10 birds per replicate. On d55 of age rectal temperature (RT) was monitored and blood samples were taken from the birds before and 1h after exposure to temperature 372oC and 50 relative humidity. There were a total of 120 chicks in Experiment II and they were divided into 3 groups which were either fed ad libitum (CONTROL) or had feed withdrawn for 12h (D5 12) or 24h (D5 24) on d5 to determine the length of feed restriction that best conferred thermotolerance on the birds. RT and blood sampling were also done as described above. In Experiment I haematological parameters were (P0.05) similar among the treatments before and after exposure. Prior to the exposure to heat stress RT was not affected (P0.05) by feeding regimen but it was significantly (P0.05) affected by the treatment after the exposure. D5 chickens had significantly (P0.05) lower temperature than control. However it was not different from D3 and D4 chickens. In Experiment II initial RT did not differ among the 3 treatment groups although RT was (P0.05) affected by the feeding regimen after 60 minutes of exposure. The control chickens had similar RT with that of D5 12. However RT in control birds (P0.05) was higher than RT in D5 24. Thus applying EFR in broilers on D5 of post-hatch for 24 hours may help reduce hyperthermia during heat spell at market age.

Full text available from: Official URL: http://www.pertanika2.upm.edu.my/Pertanika%20PAPER...

Abstract

Broiler chicks were subjected to early feed restriction (EFR) on d3-5 post-hatch to determine the day that confers the best thermal tolerance during acute heat stress episode at market age. In Experiment I 160 Marshall chicks were allotted to 4 treatments. One group received feed ad libitum (CONTROL) while others received no feed for a period of 24 hours on d3 (D3) d4 (D4) and d5 (D5) respectively. Each group had 4 replicates with a total of 10 birds per replicate. On d55 of age rectal temperature (RT) was monitored and blood samples were taken from the birds before and 1h after exposure to temperature 372oC and 50 relative humidity. There were a total of 120 chicks in Experiment II and they were divided into 3 groups which were either fed ad libitum (CONTROL) or had feed withdrawn for 12h (D5 12) or 24h (D5 24) on d5 to determine the length of feed restriction that best conferred thermotolerance on the birds. RT and blood sampling were also done as described above. In Experiment I haematological parameters were (P0.05) similar among the treatments before and after exposure. Prior to the exposure to heat stress RT was not affected (P0.05) by feeding regimen but it was significantly (P0.05) affected by the treatment after the exposure. D5 chickens had significantly (P0.05) lower temperature than control. However it was not different from D3 and D4 chickens. In Experiment II initial RT did not differ among the 3 treatment groups although RT was (P0.05) affected by the feeding regimen after 60 minutes of exposure. The control chickens had similar RT with that of D5 12. However RT in control birds (P0.05) was higher than RT in D5 24. Thus applying EFR in broilers on D5 of post-hatch for 24 hours may help reduce hyperthermia during heat spell at market age.

[error in script]

Item Type:	Article
AGROVOC Term:	Broiler chickens
AGROVOC Term:	Feeding preferences
AGROVOC Term:	Heat stress
AGROVOC Term:	Hyperthermia
AGROVOC Term:	Meteorological observations
AGROVOC Term:	Rectal temperature
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:27
URI:	http://webagris.upm.edu.my/id/eprint/21357

Actions (login required)

View Item