Ractopamine and Other Growth-Promoting Compounds in Beef Cattle Operations: Fate and Transport in Feedlot Pens and Adjacent Environments
Jonathan K. Challis, Srinivas Sura, Jenna Cantin, Anthony W Curtis, K. M. Shade, Tim A. McAllister, Paul D. Jones, John P. Giesy, Francis J. Larney
Abstract
= 18-49 days), and contamination of adjacent sites was observed, likely via transport of windblown particulates. Concentrations in runoff water from pen floors extrapolated to larger-scale commercial feedlots revealed that a single rainfall event could result in mobilization of gram quantities of RAC. This is the first report of RAC occurrence and fate in cattle feedlot environments, and will help understand the risks posed by this chemical and inform appropriate manure-management practices.
Topics & Concepts
FeedlotRactopamineManureBeef cattleSurface runoffAnimal sciencePastureManure managementFecesContaminationEnvironmental scienceChemistryEnvironmental chemistryBiologyAgronomyEcologyPharmacological Effects and AssaysPharmaceutical and Antibiotic Environmental ImpactsPesticide Residue Analysis and Safety