U.S. exporters of distiller's dried grains (DDGs) are facing the threat of diminished access to their most lucrative market after a decision by China to launch a trade remedy investigation into imports of the animal feed product, a move that U.S. sources said is an attempt by Beijing to offset the effects of high domestic commodity prices. China's Ministry of Commerce announced it was launching the antidumping (AD) and countervailing duty (CVD) investigations into U.S. DDGs in separate notices published...