The United States won a long-running trade dispute with China on Friday when the World Trade Organization found that Beijing had broken global rules by imposing anti-dumping duties on U.S. chicken broiler parts.

The U.S. complaint, first raised in September 2011, was widely seen as one of a string of tit-for-tat disputes between the world’s largest economies and followed a U.S. ban on imports of Chinese cooked chicken.

The ruling could be a boost to U.S. poultry exporters. The U.S. complaint cited damage done to such exporters as Pilgrim’s Pride, Tyson Foods and Keystone Foods.

An official with the U.S. trade representative’s office estimated that the United States has lost about $1 billion in broiler product sales since the duties were imposed by China in 2010.

Since 2010, the Chinese Ministry of Commerce has had anti-dumping duties in place on Tyson, Keystone and Pilgrim’s Pride ranging from 43.1 percent to 80.5 percent, and a “weighted-average” duty of 64.5 percent on imports from 32 additional U.S. companies.

“China’s prohibitive duties on broiler products were followed by a steep decline in exports to China, and now we look forward to seeing China’s market for broiler products restored,” Agriculture Secretary Tom Vilsack said at a news conference.