A comprehensive index for assessing environmental stress in animals

Journal of Animal Science
T L MaderJ B Gaughan

Abstract

Numerous models and indices exist that attempt to characterize the effect of environmental factors on the comfort of animals and humans. Heat and cold indices have been utilized to adjust ambient temperature (Ta) for the effects of relative humidity (RH) or wind speed (WS) or both for the purposes of obtaining a "feels-like" or apparent temperature. However, no model has been found that incorporates adjustments for RH, WS, and radiation (RAD) over conditions that encompass hot and cold environmental conditions. The objective of this study was to develop a comprehensive climate index (CCI) that has application under a wide range of environmental conditions and provides an adjustment to Ta for RH, WS, and RAD. Environmental data were compiled from 9 separate summer periods in which heat stress events occurred and from 6 different winter periods to develop and validate the CCI. The RH adjustment is derived from an exponential relationship between Ta and RH with temperature being adjusted up or down from an RH value of 30%. At 45 degrees C, the temperature adjustment for increasing RH from 30 to 100% equals approximately 16 degrees C, whereas at -30 degrees C temperature adjustments due to increasing RH from 30 to 100% equal approx...Continue Reading

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Citations

Jan 21, 2014·Animal Reproduction Science·M ShanmugamU Rajkumar
Feb 26, 2014·American Journal of Veterinary Research·Miles E TheurerRobert L Larson
Dec 24, 2013·International Journal of Biometeorology·Jeremy T HowardMatthew L Spangler
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