The long-term outlook for U.S. agricultural exports, and especially feed grains and animal products, is very promising despite the current uncertainty over the North American Free Trade Agreement (NAFTA) and other trade agreements, economists said at a recent conference on the export economy.

U.S. farmers are world leaders in growing sustainable feed grains and in producing high-quality pork, beef, poultry and other animal products. That puts them in a sweet spot to take advantage of the growing demand for protein by the growing middle class in developing economies in...