Abstract
Recently, there has been interest in constructing mechanical ventilation with evaporative pads to improve the environmental conditions for cows during periods of heat stress. Low profile cross-ventilated freestalls with evaporative pads (LPCV) have become a popular system. The purpose of this study was to evaluate how well these LPCV systems improve the temperature-humidity index (THI) under different ambient conditions. As ambient humidity increases, ability of the LPCV to reduce THI is decreased. Producers wishing to construct LPCV barns should carefully evaluate the climate in which they want to construct LPCV structures.; Dairy Day, 2007, Kansas State University, Manhattan, KS, 2007; Dairy Research, 2007 is known as Dairy Day, 2007
Highlights
Producers have used crossventilation with evaporative pads to cool the air around the cow
Recently, there has been interest in constructing mechanical ventilation with evaporative pads to improve the environmental conditions for cows during periods of heat stress
There has been interest in constructing mechanical ventilation with evaporative pads to improve the environmental conditions for cows during periods of heat stress
Summary
Producers have used crossventilation with evaporative pads to cool the air around the cow. As water is evaporated into the air, temperature will drop, and humidity will increase. Expected changes in THI, under different environmental conditions, using evaporative cooling, is presented in Figures 1 and 2. It becomes more difficult to change the environment in which the cow is housed. It is important to have realistic expectations about the ability of these systems to change the environmental conditions in which they will be operated.
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