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This photo taken on August 10, 2018 shows pigs resting in a pen at a pig farm in Yiyang county, in China's central Henan province. - The powdery yellow mixture of soybean-based feed for pigs -- one-fifth soy -- has become pricier as the trade spat between China and the US escalates, with Beijing slamming US soybean imports with tariffs of 25 percent last month. (Photo by GREG BAKER / AFP) / TO GO WITH China-US-trade-pork, FOCUS by Becky DAVIS        (Photo credit should read GREG BAKER/AFP/Getty Images)