Agricultural and Biosystems Engineering Publications

Document Type

Article

Publication Date

2001

Journal or Book Title

Applied Engineering in Agriculture

Volume

17

Issue

1

First Page

91

Last Page

96

Research Focus Area(s)

Animal Production Systems Engineering

Abstract

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 (Tb) 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 Tb than those under TV only or TV + HZV (P < 0.01 and P < 0.001, respectively). DC under HAM was less effective for Tb 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 the most cost-effective cooling scheme.

Comments

This article is from Applied Engineering in Agriculture 17, no. 1 (2001): 91–96.

Copyright Owner

American Society of Agricultural Engineers

Language

en

Date Available

December 13, 2012

File Format

application/pdf

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