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Climatic variation in the pig building facilities according to the production environment (temperate or tropical): (a) daily variation and (b) hourly climatic fluctuation. T = ambient temperature; RH = relative humidity; THI = temperature–humidity index, calculated according to the following formula: THI (°C) = T − (0.55 − 0.0055 × RH) × (T − 14.5), proposed by the National Oceanic and Atmospheric Administration (NOAA, 1976; cited by Zumbach et al. [2008]).
