CHICAGO, May 19 Talks on restarting U.S. beef exports to China are moving fast and final details should be in place by early June, the U.S. Department of Agriculture said on Friday, allowing American farmers to vie for business that has been lost by rival Brazil. As part of a trade deal, U.S. ranchers are set to face tests over the use of growth-promoting drugs to raise cattle destined for export to China and to log the animals' movements, according to the USDA.