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Air velocity in the poultry house is one of the most important factors in creating the optimal environment for broiler raising. This indicator affects the stress level and the number of respiratory diseases of broilers, and, consequently, their performance. The study was conducted in the technological module, which was a block container with the dimensions of 6x2.5x3 m, designed for the one-time fattening of up to 310 broilers in cages. To ensure the optimum air velocity, the module was equipped with the tunnel ventilation system with three inlets and six exhaust fans arranged in pairs at each level of the cage battery.To determine the air velocity in the module, an active experiment method was applied, which involved measuring the airflow rate on all tiers of the cage battery while operating one, two or three pairs of exhaust fans.The air velocity was measured on the reference points at the height of birds’ places and near the ventilation inlets of each tier of the cage battery. According to the measurements, the air velocity inside the module varied in the range from 0.01 m·s -1 with one operating pair of fans to 0.97 m·s -1 with the three pairs of fans working. The minimum values of air velocity (from 0.01 to 0.1 m·s -1 ) were in line with the regulatory indicators for broiler growing from zero to fourteen days of age; the average experimental values from 0.1 to 0.5 m·s -1 corresponded to regulatory indicators for growing broilers from fifteen to twenty-one days of age; and the maximum values of air velocity from 0.5 to 0.97 m·s -1 corresponded to the regulatory indicators for the birds older than twenty-two days. The study proved the tunnel ventilation system installed in the module to provide the required air exchange without exceeding the permissible air velocity values inside the production premises.

Study results of the air velocity inside the technological module for broiler chickens fattening