Acute synergistic effects of air temperature, humidity, and velocity on homeostasis of market-size broilers

文献类型： 外文期刊

第一作者： Tao, X

作者： Tao, X;Xin, H

作者机构：

关键词： Body temperature;Heat stress;Telemetry;Temperature humidity index (THI);Temperature humidity velocity index (THVI);Thermoregulation

期刊名称：TRANSACTIONS OF THE ASAE （ 影响因子：0.664； ）

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年卷期：

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收录情况： SCI

摘要： Core body temperature (t{sub}b) of market-size male broilers (46 ± 3 d; 2.8 ± 0.1 kg; Ross × Ross breed) was continuously measured by telemetry during acute, 90- to 240-min exposures to 18 thermally challenging conditions. The thermal conditions consisted of 18 factorial combinations of three dry-bulb air temperatures (t{sub}(db); 35℃, 38℃, and 41℃), two dewpoint temperatures (t{sub}(dp); 19.4℃ and 26.1℃), and three air velocities (V; 0.2, 0.7 and 1.2 m s{sup}(-1)). Based on t{sub}b rise after 90-min exposures to the thermal conditions, a temperature-humidity-velocity index (THVI) was developed to delineate the synergistic effects of the thermal components on the birds, having the form of THVI = (0.85t{sub}(db) + 0.15t{sub}(wb)) × V{sup}(-0.058), where t{sub}(wb) = wet-bulb temperature. The homeostasis state of the bird was classified as normal alert, danger, or emergency, which correspond to a t{sub}b rise threshold of 1.0℃, 2.5℃, 4.0℃, or >4.0℃, respectively. These different homeostasis states were functionally and graphically expressed in terms of THVI and exposure time. For example, if the broilers were acutely exposed to a thermal condition for 90 mm, then the THVI threshold for the normal alert danger, and emergency state would be about 35℃, 38℃, 40℃, and >40℃, respectively. If the exposure duration was increased to 120 min, the THVI threshold would drop to 34℃, 37℃, 38℃, and >38℃, respectively. The results of this study serve as a scientific basis for making management decisions and risk assessment associated with market-size broiler production and handling under thermally challenging conditions.

分类号： S22

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