Russia is considering imposing restrictions on meat imports from a number of countries over fears that they use the growth promoter ractopamine in ani

Tyson Foods, the largest US-owned pork processor, is prohibiting the use of ractopamine to help meet growing demand for US pork.

The long-running international dispute over ractopamine, a drug used to boost growth and leanness in pork and beef production, has become even more co