Workers at the Heinz Frozen Food plant in Pocatello, Idaho, are to have a four-week seasonal layoff instead of the usual two weeks, and so will be idle until 6 May.

The plant's 400 workers, who make entrees including Boston Market, Weight Watchers and Hot Bites snacks, have been off since 8 April and are now due to return to work 6 May.

"We're trying to drive down our inventory positions, our investment in working capital," said factory manager Dave Simmons.