WEST SALEM, WI -

The heat and humidity isn't only tough on people who work outside, it can cause problems for our dairy cows.

Experts say the high temperatures can reduce a cow's milk production by up to 15 percent. That's about two gallons a day.

It takes a few days for symptoms of heat stress to show on cows.

To prevent it, dairy farmers constantly keep cold water in front of them, routinely feed the cattle, and keep fans running on them all day. "The less milk they produce, the less money there is to pay bills and that really hurts, especially with the milk price lower like it is now," said a dairy cow exhibitor Robin Muenzenberger at the La Crosse Interstate Fair.

He says they're keeping a close eye on a couple of cows, and are waiting to see what the rest of the week's heat will do.