initiated modifications to improve the welfare of
dairy cows. The previously used cross-ventilation of
barn, comb slots and existing fans above the centre
of lying down double-boxes added new elements of
ventilation. Fans DF1300 were installed due to the
feeding area. The airflow directed to the animals
that were feding at the time. Havlik [3] in his
publication says that the installation of the fans is
above the feeder error. Dairy cows stand here longer
time, in some cases they even lie down on the floor.
In the experimental stable was not negative behavior
of dairy cows recorded. Although there was
directing air flow velocity an average of 0.11m/s, it
was showed a positive effect on total milk
production. Lactation has evolved in the opposite
trend and overall it increased in the second year of
experiment. The increase of total milk production
was an average of 5,755 liters. With the results
identifies Wells [13], who in his book says that the
proper setup and use of ventilation in the barn for
dairy cows is possible to achieve of better health
and increase milk production. Also Frazzi [14]
concluded that adequate optimization of
microclimate in the barn during the summer months
is possible to increase milk production.