Soybean prices gained higher amid speculation that supply disruptions in South America could prompt overseas buyers to turn to the U.S. for crops instead. Prices for the oilseeds advanced as truckers in Brazil resumed protests, reviving a work stoppage first executed in February, when truckers in that country blocked roads in main farming regions to protest fuel-tax increases and low wages. Analysts said stalled negotiations with the government had prompted truckers to continue protests, reviving the U.S. soybean market. Brazilian ports are well stocked with soybeans, enabling shippers to fill orders to foreign buyers, though the protests provided a psychological boost to the market on Thursday. Strong domestic demand from U.S. soybean crushers also supported prices. May soybean gained 7 3/4 cents, or 0.8%, to $9.78 1/4 a bushel, the highest closing price in 3 weeks.