May 9, 2008 - DUBLIN, Ireland — Guinness beer owner Diageo PLC rattled an Irish icon Friday, announcing plans to lay off more than half of its brewery workers, close two breweries and shift most production to a new, high-tech plant in the Dublin suburbs by 2013.

The British beverage maker decided not to close the landmark Guinness brewery, one of Dublin's oldest businesses and a top tourist attraction, after…