MADISON, Wis. (AP) — An entire herd of whitetail deer on a farm in southwest Wisconsin has been euthanized because of chronic wasting disease, state agriculture officials said.

More than 100 deer in Iowa County were euthanized last month after about 20 tested positive for the disease, The La Crosse Tribune reported . Veterinarians and animal health technicians from the Wisconsin Department of Agriculture, Trade and Consumer Protection and the U.S. Department of Agriculture-Animal and Plant Health Inspection Service sedated the animals before euthanizing them.

The deer had been quarantined since October, when the DATCP confirmed a deer shot on a Waupaca County hunting ranch tested positive for the disease. The deer was traced back to the Iowa County farm.

Nearly 80 deer in the county that were 16 months old or older were tested for the disease.

Chronic wasting disease is a neurological disorder found in deer, elk and moose. It’s caused by an infectious protein that affects the animal’s brain.

State and federal indemnity programs will compensate the deer farm, though an amount has yet to be determined.