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http://dx.doi.org/10.5536/KJPS.2015.42.3.257

Effects of Repeated High Ambient Temperature on Performance in Broilers Heat-Conditioned at an Early Age  

Hwangbo, Jong (Division of Poultry Science, National Institute of Animal Science, RDA)
Yang, Young-Rok (Dept. of Animal Science, Gyeongsang National University)
Yoon, HyungSook (Dept. of Animal Science, Gyeongsang National University)
Kim, Jimin (Dept. of Animal Science, Gyeongsang National University)
Park, Byungsung (Dept. of Animal Biotechnology, Kangwon National University)
Choi, Hee Chul (Division of Poultry Science, National Institute of Animal Science, RDA)
Choi, Yang-Ho (Dept. of Animal Science, Gyeongsang National University)
Publication Information
Korean Journal of Poultry Science / v.42, no.3, 2015 , pp. 257-265 More about this Journal
Abstract
Heat conditioning at an early age has been known to help chickens cope with heat stress later in life. The present study was conducted to determine the effects of heat conditioning at 5 days of age in broilers repeatedly exposed to high ambient temperature later in life. A total of 256 day-old Arbor Acre boiler chicks were housed in two identical rooms with a 23-h light/1-h dark cycle and provided with feed and water ad libitum. At 5 days of age, the birds in one room were exposed to $37^{\circ}C$ for 24 hours, while those in the other room served as controls. On day 21, half of the birds in each room were moved into the other room so that each room contained both control and heat-conditioned birds. After a 7-day adaptation period, the birds in one room were exposed to high ambient temperature ($21^{\circ}C{\rightarrow}31^{\circ}C$) for 3 days, whereas those in the other room were kept at normal temperature. The same 3-day exposure to high ambient temperature was repeated two weeks later. Hence, there were four treatment groups (CON+CON: control+control; CON+HS: control+high ambient temperature; HC+CON: heat conditioning+control; and HC+HS: heat conditioning+high ambient temperature). Repeated heat stress resulted in decreased feed intake, water intake, body weight gain, and spleen weight (p<0.05) and increased rectal temperature (p<0.05), mortality, and plasma corticosterone concentrations. The relative weight of the spleen was increased in the heat-conditioned group (p<0.05). Plasma biochemicals were also influenced by high temperature. Thus, no beneficial effects of heat conditioning at an early age were detected in broilers repeatedly exposed to high ambient temperature later in life.
Keywords
broilers; early heat conditioning; repeated high ambient temperature; performance;
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Times Cited By KSCI : 1  (Citation Analysis)
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