Temperature-Humidity Index (Livestock)
USDA-ARS THI from temperature and RH, with species-specific heat-stress band (dairy / beef / hog / poultry / horse) and a recommended cooling intervention.
Formula and source
THI = T_F - (0.55 - 0.0055 * RH) * (T_F - 58). Species stress bands: dairy 72/79/89/99; beef 74/80/90/99; hog 75/82/90/99; poultry 70/75/85/95; horse 72/79/89/99.
USDA-ARS livestock heat-stress publications; Kansas State University Cooperative Extension. Public domain.
Audience
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