Comparative evaluation of cooling systems for farrowing sows

文献类型： 外文期刊

第一作者： Dong, H

作者： Dong, H;Tao, X;Lin, J;Li, Y;Xin, H

作者机构：

关键词： drip cooling;heat stress;horizontal air mixing;localized cooling;sow;tunnel ventilation

期刊名称：APPLIED ENGINEERING IN AGRICULTURE （ 影响因子：0.985； 五年影响因子：1.02 ）

ISSN： 0883-8542

年卷期： 2001 年 17 卷 1 期

页码：

收录情况： SCI

摘要： The field studies reported here compare the performance of three cooling sq stems for relieving farrowing/lactating sows of heat stress under the warm and humid production climate in southern China. The comparative systems included (1) tunnel ventilation (TV) with vertical head-zone ventilation (HZV) vs. TV with HZV and drip cooling (DC), (2) TV only vs. TV with DC, and (3) horizontal air mixing (HAM) only vs. HAM and DC. For the HZV, a perforated overhead air duct was used to create an air velocity of 0.6 to 0.8 m/s (118 to 157 ft/min) in the head zone of the sow. The paired tests were conducted successively in an experimental commercial farrowing barn housing 42 sows. Body temperature (T-b) and respiration rate (RR) of the sows were used to evaluate the efficacy of the systems. The results indicate that sows under TV + DC or TV + HZV + DC had significantly lower T-b than those under TV only or TV + HZV(P < 0.01 and P < 0.001, respectively). DC under HAM was less effective for T-b reduction (P > 0.05). DC reduced RR in all cases, 42% under TV (P < 0.01), 41% under TV + HZV(P < 0.01), and 22% under HAM (P > 0.05). It was concluded that TV with DC provides rite most cost-effective cooling scheme.

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