We as humans get in "heat stress" at high summer temperatures and/or high humidity, which challenges our body. For cows as "suppliers" of milk, cream, yogurt, the level of heat stress is much lower than for us, because their metabolism is working hard to convert grass, grain or corn into milk. This generates a lot of heat, which cows can poorly dissipate through their skin (leather).
Cows feel comfortable at -5 to +20° C; above these temperatures stress begins for them and we can use Lechler nozzles to ensure that they are still feeling well – also in the interests of animal welfare. The consequences of heat stress are less feed intake, less movement of the animals and also a lower production of milk, with higher costs for the farmer.
In addition to large fans to cool the animals, nozzles are used more and more to increase the cooling effect.