Temperature-humidity indices as indicators of milk production losses due to heat stress.

By J. Bohmanova, Ignacy Misztal, J. Cole. Journal of Dairy Science, 2007

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Is the temperature-humidity index the best indicator of heat stress in lactating dairy cows in a subtropical environment? (2009, methodology): “2°C in the current study compared with 72°C for cows in Georgia and 74°C for cows in Arizona (Bohmanova et al., 2007).”
Invited review: Effects of heat stress on dairy cattle welfare. (2017, methodology): “Moreover, calculating environmental heat stress is dependent on which formula is chosen, as THI equations can weight humidity or dry-bulb temperature to account for different environmental conditions (Bohmanova et al., 2007).”
Metabolic and hormonal acclimation to heat stress in domesticated ruminants. (2010, background): “A plethora of biometeorological indices has been developed and these empirical formulas would ideally predict the weather conditions when ruminants start to experience heat stress (Bohmanova et al., 2007) and become susceptible to heat-induced death (Vitali et al., 2009).”
Defining and evaluating heat stress thresholds in different dairy cow production systems (2012, methodology): “Bohmanova et al. (2007) compared several THI formulae for different regions in the USA based on the decline in daily milk yield.”