GREELEY, Colo. -- The immigration raids at Swift & Co. in Greeley and five other states last month could cost the company $30 million.

Swift officials said the raid cost the company $20 million in downtime and training time for new employees.

The company expects to spend another $10 million to retain workers and hire back old employees. In Greeley, Swift placed newspaper ads offering new hires a signing bonus of $1,500.

Swift said it's still not back at normal production.

The raids at six Swift meat plants rounded up about 1,300 Swift & Co. workers.

Operations at the six plants were suspended six to seven hours on Dec. 12 while immigration officials interviewed employees, the company said.

In a conference call Friday morning, Swift officials plan to discuss the company's financial results for its latest fiscal quarter ended Nov. 26.

With more than $9 billion in annual sales, Swift describes itself as the world's second-largest processor of fresh beef and pork products.

Privately held Swift on Thursday reported a net loss of $11.99 million for its latest fiscal quarter, narrowed from a loss of $17.86 million in the same period a year earlier.

It reported net sales of $2.47 billion for the quarter, up 6.9 percent from $2.31 billion in the same period a year earlier as beef prices rose 5.2 percent. Swift Australia sales increased nearly 16 percent to $511 million due to higher availability of cattle and more customer demand.

Immigration and Customs Enforcement agents raided plants in Greeley; Grand Island, Neb.; Cactus, Texas; Hyrum, Utah; Marshalltown, Iowa; and Worthington, Minn. The plants represented all of Swift's domestic beef processing capacity and 77 percent of its pork processing capacity.

U.S. Commodities Inc. President Don Roose said other companies filled the void in slaughtering following the raids at Swift plants, leading to little effect on meat prices at the grocery store.

"There's enough meat in the coolers and the supply chain that I don't think it had as much of an effect as it could've had if it was in shorter supply in the chain," Roose said.

Cattle Fax senior analyst Kevin Good said it would be difficult to separate which changes in meat prices were due to the immigration raids and which were was due to other disruptions like the holidays and recent snowstorms.

The company has not released its daily slaughter rates from before and after the raids.