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Comparative Evaluation of Cooling Systems for Farrowing Sows
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Applied Engineering in Agriculture. Vol 17(1): 91-96 . (doi: 10.13031/2013.1930) @2001
Authors: H. Dong, X. Tao, J. Lin, Y. Li, H. Xin
Keywords: Drip cooling, Heat stress, Horizontal air mixing, Localized cooling, Sow, Tunnel ventilation
The field studies reported here compare the performance of three cooling systems 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