Sensible and Latent Heat Productions from Broilers in Laboratory Conditions

Authors : Levent GENÇ

Pages : 635-643

View : 15 | Download : 14

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Heat production from chickens and other resources inside the broiler house is a major problem for the broiler industry. Temperature and relative humidity insert ignore into journalissuearticles values(RH); as well as airflow and broiler physiology directly affect heat production in broiler houses. This study was carried out under laboratory conditions to determine heat production for male broilers. In the laboratory experiment, 108 broilers were used to determine the influence of different temperature-humidity combinations on the physiological response of 2.0 to 2.3 kg broilers during the 40 min test. In the laboratory experiment, three dry bulb insert ignore into journalissuearticles values(DB); temperatures insert ignore into journalissuearticles values(25 °C, 30 °C, and 35 °C); and three RHs insert ignore into journalissuearticles values(50%, 70%, and 90%); were used in a block design with four replications, 3 birds per test. DB and wet bulb insert ignore into journalissuearticles values(WB); temperatures of air entering and exiting the chamber were measured. Before and after each test, body temperatures were measured to control the stress level, and sensible heat production insert ignore into journalissuearticles values(SHP); and latent heat production insert ignore into journalissuearticles values(LHP); were calculated based on DB and WB temperatures. It was found that SHP decreased when the temperature and humidity combination increased. When initial DB temperature was 24.8 ± 0.2 °C and RH was 71%, SHP and LHP were 2.1 ± 0.3 W/kg and 4.0 ± 0.4 W/kg respectively. Increasing RH 50% to 86%, decreased the LHP from 5.7 ± 0.6 to 3.0 ± 1.0 W/kg at the 24.8 °C. Latent heat production increased as DB temperature increased at 50% and 70% RH. At 90% RH, latent heat loss was zero for both 30 and 35 °C. Results also showed that broiler body temperature difference insert ignore into journalissuearticles values(BTD); increased when initial dry bulb insert ignore into journalissuearticles values(IDB); and initial relative humidity insert ignore into journalissuearticles values(IRH); combinations increased
Keywords : Heat production, sensible heat, latent heat, broiler, temperature, relative humidity