Paylean® is used in the swine industry to increase growth rate, carcass lean deposition and feed efficiency. Its active ingredient is ractopamine hydrochloride. At 5 mg/kg, ractopamine improved carcass quality and growth performance. Paylean may also be able to reduce the environmental impact of pork production through improving nitrogen retention and decreasing nitrogen output in the feces and urine of finishing swine. 120 barrows were used to measure growth performance and nutrient retention in the carcass when given 0, 5, or 10 mg/kg ractopamine in their diet at three levels of dietary lysine. Gain to feed ratio, average daily gain and average daily feed intake were not affected. Increasing lysine improved the gain to feed ratio, while increasing ractopamine increased protein deposition and decreased lipid deposition.
Ractopamine, at 5 or 10 mg per kg, Increases Protein Deposition in the Carcass (full article)
