Tianjin Xinxing Veterinary Pharmaceutical Factory is one of the first batch large and medium size enterprises authorized by ministry of agriculture. Xinxing established on 1986 and the current total asset is one hundred and fifty million. Nankai University and Tianjin University of science and technology is the factory scientific research base. As well as we are the council member of China Veterinary Drug Association, China Animal Husbandry Association and China feedstuff Industry Association. In 1999, Xinxing has been entitled import-export rights. In recent years, Enterprise not only passed ISO9001 international quality system, but also has been granted the authentification of China GMP and Australia GMP. Xinxing is the new and high technology enterprise of biological fermentation goods and can annually produce 20000 tons the product includes Colistin Sulfate Premix, Zinc Bacitracin Premix, Bacitracin Methylene Disalicylate Premix and Zinc Bacitracin and Colistin Sulfate (5: 1) Mixture Premix. The product exports to more than 30 countries around Europe, Asia, Australia and South America etc.