Researchers from Purdue University are unlocking possible ways to extend the benefits of a feed additive that makes pigs meatier. Ractopamine hydrochloride is an effective and popular supplement, but it begins to lose its effectiveness seven to 10 days after the initial feeding. Understanding how ractopamine speeds growth in hogs and makes them leaner may enable scientists to make it more valuable for producers by increasing the additive's effective period or creating new, similar drugs, said Scott Mills, Purdue associate professor of animal science.