MONROE, Wis. (AP) -- A Green County farmer says his dairy business is struggling to recover after a lightning strike killed eight of his cows this week.

Brad and Cathy Timm were at home Thursday evening when a loud boom rattled the entire house.

The boom was apparently a lightning strike that hit a tree at the edge of their field. Eight cows that had been gathered around the tree were killed.

Timm had about 40 cows, meaning the loss represents about a 20 percent loss in income. That doesn't include the fact that the cows were worth about $15,000.

The Timms tell WMTV-TV the loss is tough to swallow. But they add that in their business a person learns to move on.