A Wisconsin cheese producer has notified 11 state dairy farms that it will stop buying their milk in 60 days, an official with the state’s cheesemakers’ association is saying.Arla Foods’ Hollandtown Dairy in Kaukauna notified the farms either Monday or Tuesday, according to John Umhoefer, the executive director of the Wisconsin Cheese Makers Association.Umhoefer said an Arla Foods executive told him the company is no longer buying milk from the farms because “they are oversupplied for their needs.”The decision comes at a bad time for dairy farmers, who have been dealing with depressed milk prices for four consecutive years.