Bittner, C J Effect of ractopamine hydrochloride (Optaflexx) dose and duration on growth performance and carcass characteristics of finishing steers. [electronic resource] - Journal of animal science Dec 2016 - 5382-5392 p. digital Publication Type: Journal Article; Randomized Controlled Trial ISSN: 1525-3163 Standard No.: 10.2527/jas.2016-0807 doi Subjects--Topical Terms: Adrenergic beta-Agonists--administration & dosageAnimal Feed--analysisAnimal Nutritional Physiological PhenomenaAnimalsBody Composition--drug effectsCattle--growth & developmentDiet--veterinaryDose-Response Relationship, DrugMalePhenethylamines--administration & dosageWeight Gain--drug effects