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Influence of β-Agonists (Ractopamine HCl and Zilpaterol HCl) on Fecal Shedding of Escherichia coli O157:H7 in Feedlot Cattle

Permanent URL:
http://handle.nal.usda.gov/10113/38221
File:
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Abstract:
Ractopamine HCl and zilpaterol HCl, β-agonists recently approved for use in feedlot cattle to improve performance traits and carcass leanness, were examined for their effects on fecal shedding of Escherichia coli O157:H7 in feedlot cattle. Fecal samples (n = 2,454) were obtained from four experiments (one ractopamine HCl, three zilpaterol HCl) over the course of a 3-year period, either by rectal palpation (ractopamine HCl experiment) or from pen-floor fecal pats. Samples were cultured quantitatively and qualitatively for E. coli O157:H7. No significant treatment differences were detected for fecal prevalence of E. coli O157:H7 in the ractopamine HCl experiment. Zilpaterol HCl feeding had no effect (P > 0.20) on fecal shedding in the first or second experiments, with overall E. coli O157:H7 prevalence relatively low (<7%). In the third zilpaterol HCl experiment, the percentage of fecal samples that were E. coli O157:H7 positive following qualitative culture was higher (P < 0.05) in the zilpaterol HCl treatment (10.3%) than for the control (6.1%). The current research showed minimal effects of β-agonists on fecal shedding of E. coli O157:H7 and indicated that these compounds (fed immediately prior to slaughter) are not a cause for concern from a food safety standpoint.
Author(s):
Edrington, Tom S. , Farrow, Russell L. , Loneragan, Guy H. , Ives, Sam E. , Engler, Michael J. , Wagner, John J. , Corbin, Marilyn J. , Platter, William J. , Yates, David , Hutcheson, John P. , Zinn, Richard A. , Callaway, Todd R. , Anderson, Robin C. , Nisbet, David J.
Subject(s):
beef cattle , feedlots , beta-adrenergic agonists , feed additives , shedding , finishing , feces , Escherichia coli O157:H7 , food pathogens , bacterial contamination , slaughter , cross contamination , plate count
Format:
p. 2587-2591.
Note:
Includes references
Source:
Journal of food protection 2009 Dec., v. 72, no. 12
Language:
English
Year:
2009
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.