The aim of this article to present of research results of microclimate parameters in barns with different gravitational ventilation
systems and comparison of efficiency of these systems. Two tied-up and three loose-housing barns for dairy cows and
one for beef cattle were researched. Tied-up barns had functional attic and duct ventilation, in barns with loose housing
systems there were skylights with roof ridge gap. In stalls with ventilation by vertical channels there was not sufficient area
of air inflow and outflow. The negative consequence of this was overcoming of recommended internal relative humidity of
air (80%) in these stalls. In non-littered barns, with roof- ridge gap ventilation, temperature of air exceeded recommended
values of 25oC. The luminance of daily light in stalls with functional attic was below of minimal level, which was described
by standards (100 lx).
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