Table 9.
Meteorological attributes, THI calculations, and physiological response of dairy cows for control treatments and barns equipped with ceiling fans.
| Reference | Location | Breed | System 1 | Tdb | RH | THI 2 | VT | RR | MY |
|---|---|---|---|---|---|---|---|---|---|
| (°C) | (%) | (°C) | (Breaths min−1) | (kg∙day−1) | |||||
| Bucklin et al. [32] | Florida, US | Holstein | O | 33.9 | 50.0 | 83.4 | |||
| OB + K + CF | 29.7 | 55.0 | 78.7 | ||||||
| Worley and Bernard [90] | Georgia, US | Holstein | OB + M + F | 39.3 | |||||
| OB + CF | 39.5 | ||||||||
| Meyer et al. [91] | Kansas, US | Holstein | OB + K + F | 75 | 40.1 | ||||
| OB + K + CF | 84 | 37.1 |
Abbreviations: Tdb = dry-bulb temperature, RH = relative humidity, THI = temperature-humidity index, VT = vaginal temperature, RR = respiration rate, MY = milk yield; 1 Housing system components: O = outside, OB = open-sided barn, K = sprinkler, CF = ceiling fan, M = mister, F = circulation fan; 2 Calculated from Schüller et al. [44]: THI = (1.8Tdb + 32) − [(0.55 − 0.0055RH)(1.8Tdb − 26)].