Surface wetting and its optimization to cool broiler chickens

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： Air vapor pressure deficit;Air velocity;Body temperature;Heat stress;Surface temperature

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

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Surface wetting to cool broiler chickens (Ross × Ross male, 46 ±3 d, 2.8 ± 0.1 kg) was investigated under 18 acute thermal conditions formed by 3 × 2 × 3 factorial combinations of dry-bulb temperature (t{sub}(dp)) of 35℃, 38℃, and 41℃; dew-point temperature (t{sub}(dp)) of 19.4℃ and 26.1℃; and air velocity (V) of 0.2, 0.7, and 1.2 m s{sup}(-1). The synergistic effects of t{sub}(db) and t{sub}(dp) were expressed in terms of vapor pressure deficit of the air (VPD{sub}(air), kPa). Surface temperature of the cooled birds was 1.9℃ to 2.5℃ lower than that of their control counterparts. Core body temperature (t{sub}b) rise above the normal level for the cooled birds was 1.2℃, 1.6℃, and 1.7℃ lower than that for the control birds at 35℃, 38℃, and 41℃, respectively. Increasing V tended to narrow the difference in t{sub}b between the cooled and the control broilers, 2.0℃, 1.4℃, and 1.2℃ for V of 0.2, 0.7, and 1.2 m s{sup}(-1) respectively. Increasing t{sub}(dp) from 19.4 ℃ to 26.1 ℃ produced only 0.2 ℃ overall difference in t{sub}b. Results of this study demonstrate that surface wetting coupled with good air movement, as in the case of tunnel ventilation, is effective in relieving heat stress of the birds even under relatively humid conditions. The cooling water needs, expressed as spray interval at a nominal spray dosage of 22 mL bird{sup}(-1) (SI{sub}(22), min) and evaporation rate (ER, mL/min kg{sup}0.67), were optimized by relating the SI{sub}22 or ER to the thermal conditions: SI{sub}22 = 70.50- 27.14(the square root of V) - 4.84VPD{sub}(air), and ER = -0.0471 + 0.1700(the square root of V) + 0.0297VPD{sub}(air).

分类号： S22

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