1. Health and Human Services, Food and Drug Administration website. Freedom of information summary. Original new animal drug application. NADA 141–221 ractopamine hydrochloride (OPTAFLEXX 45) type A medicated article for beef cattle. Available: http://www.fda.gov/downloads/AnimalVeterinary/Products/ApprovedAnimalDrugProducts/FOIADrugSummaries/ucm118030.pdf. Accessed 2013 July 10.
2. Health and Human Services, Food and Drug Administration website. Freedom of information summary. Original new animal drug application. NADA 141–258 ZILMAX (zilpaterol hydrochloride) type A medicated article for cattle fed in confinement for slaughter. Available: http://www.fda.gov/downloads/AnimalVeterinary/Products/ApprovedAnimalDrugProducts/FOIADrugSummaries/ucm051412.pdf. Accessed 2013 July 5.
3. Effects of feeding zilpaterol hydrochloride with and without monensin and tylosin on carcass cutability and meat palatability of beef steers;GG Hilton;J Anim Sci,2009
4. Effects of zilpaterol hydrochloride and days on the finishing diet on feedlot performance, carcass characteristics, and tenderness in beef heifers;RJ Rathmann;J Anim Sci,2012
5. Meta-analysis of the effects of ractopamine hydrochloride on carcass cutability and primal yields of finishing pigs;BM Bohrer;J Anim Sci,2013