Food supplier Cargill announced Wednesday that the company will close a Milwaukee facility Friday.Cargill said a diminished cattle supply will lead it to close its Milwaukee beef harvest facility on Friday, Aug. 1.VIDEO: Cargill to close its Milwaukee plant "It's going to cause a lot of families heartache. I know that for a fact. We're one of them. And you know that was what we pay our bills and everything with," said Carolyn Alexander, whose husband worked at the plant for three years. VIDEO: Workers surprised by closure announcementAt its peak, the plant can slaughter and process nearly 1,400 cattle a day, but Cargill told WISN 12 News the cattle supply nationally is at its lowest level in more than 60 years, and there simply isn't enough supply in this part of the country to keep the plant running.  The company said the facility, which employs about 600, will fulfill customer needs through the end of the year. That workload could support about 200 employees."Closing our Milwaukee beef plant is taking place only after we conducted an 18-month long analysis of the region's cattle supply and examined all other possible options," said John Keating, president of Cargill Beef.Milwaukee Mayor Tom Barrett said he got a personal call from Cargill's president an hour before it was released to the media."Obviously, this was news to us and a very, very disappointing surprise announcement. Cargill has been a great corporate citizen in Milwaukee employing a lot of people, particularly on the near south side," Barrett said.Cargill bought the plant in Milwaukee's Menomonee Valley in 2001.The company operates six other beef processing plants in California, Texas, Kansas, Colorado, Nebraska and Pennsylvania.Cargill said it will hold a job event next week for the displaced workers and try to find some of them jobs within the company at other plants. The workers losing their jobs will be paid for the next 60 days.