The world’s largest pork producer will soon raise half of its hogs on feed that doesn’t contain the additive ractopamine. Smithfield Foods CEO Larry Pope, speaking at a market conference in New York Tuesday, said two Smithfield plants that handle 43-thousand hogs a day are already ractopamine-free. But the company is going to convert a third plant on June 1st. And at that point, he said more than 50-percent of Smithfield’s operations will have no ractopamine as part of their feed rations.