At least 4,800 chicks shipped to Maine farmers through the U.S. Postal Service have arrived dead in recent weeks after rapid cuts hit the federal mail carrier’s operations, U.S. Rep. Chellie Pingree said.Pingree, a Maine Democrat, is raising the issue of the dead chicks and the losses farms are facing in a letter to Postmaster General Louis DeJoy and U.S. Department of Agriculture Commissioner Sonny