Cows Can Keep Udderly Cool
Thanks To Barn-Ventilation Advances
(Continued from Page 38)
600 feet per minute. But for the engineers, there is a
problem to overcome: the cows themselves. “Air acts
like water in a creek in many ways. The cows act like
boulders in a creek,” said Gooch. “Once the moving
air gets to the cow, the air stops and the movement dis
sipates. That’s a problem, and that’s why the velocity
of the tunnel ventilation must be so great.”
Tunnel ventilation, an agricultural concept once
found exclusively in poultry and swine farms, has
made its way to the dairy industry. Poultry and swine
producers have found that increased animal comfort
during the summer can reap economic benefits if the
tunnel ventilation system is designed, installed and
managed properly, said Gooch. “The application of
tunnel ventilation as a summertime system in the
dairy industry is relatively new,” he said.
Older-style barns without effective summertime
ventilation or wind exposure use axial-flow fans along
feed barrier and resting areas. But these fans merely
move air within the barn and do not provide air ex
change, said Gooch.
With tunnel ventilation, fans on one end gable draw
air from inside the barn and push it outside, while
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vents, called inlets, on the barn’s opposite gable pull
fresh air into the barn.
On very hot days, ventilation needs to be supple
mented by an evaporative cooling system as air condi
tioning is too costly for dairy facilities. The cooling
system works much like the human body, expelling
moisture on hot days to cool itself. In the barn, water is
discharged by small nozzles at a high pressure into
fast-moving air, lowering the temperature inside the
barn by about 10 degrees Fahrenheit, said Gooch.
“This technology is innovative and here for produc
ers to try,” said Gooch. “The cost of a TIV controller is
only slightly more than conventional stage controllers,
but it offers better management of the barn environ
ment during hot summer conditions.”
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