The results of the experiment, which took place in
the barn with dairy cows and heifers during two
years shows that the location of the fans above the
feeder was justified. Although vertical fans are most
commonly placed over the center lying down
double-boxes, adding additional the fans to the
feeder caused a change in velocity of air in the barn.
Positive values were obtained even in milk
production. It is therefore possible to attribute
positive results in an increase in total milk
production ventilation system. In warmer periods of
the year it provided the cows and heifers sufficient
cooling of the body surface. Animals were less
affected by temperature stress. Improved living
conditions in the stable were resulted in the
resulting evaluation in an increase in total milk
production, which is especially useful for breeders.