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The aim of this work is to evaluate possibility of reducing the heat stress of milking cows via climatic indices and the influence of air flow velocity in the object with milking cows using the cross-section method. For the purposes of evaluation, there was selected a four-row housing facility for 160 milking cows with natural ventilation; for the summer period, natural ventilation was supplemented with mechanical ventilation (2877 m 3 ·h −1  per cow). Measurements were conducted in the network created with 12 measuring points across the barn width, repeated in five cross-sections A, B, C, D and E, followed by further measurements in the longitudinal direction performed always in a row of 22 points placed in resting zones along the air flow direction. Considering the state of potentially high heat load with THI &gt;78, it was observed that, according to ETIC, without employing the fans, ETIC in AOZ was higher than nAOZ, ETIC AOZ  = 25.34 ±0.42 vs ETIC nOAZ  = 24.51 ±0.44 ( p   100 h −1 , and barn length.

Assessment of the Possibility of Reducing the Thermal Load in the Barn by using Mechanical Ventilation