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Use of Bacitracin and Roxarsone to Reduce Salmonella Heidelberg Shedding Following a Necrotic Enteritis Challenge Model¹

C. L. Hofacre^*,2, G. F. Mathis, S. H. Miller and M. W. LaVorgna

^* Department of Population Health, Poultry Diagnostic and Research Center, University of Georgia, Athens 30602; Southern Poultry Research, Athens, Georgia 30607; Alpharma Inc., Cumming, Georgia 30041; and Alpharma Inc., Salisbury, Maryland 21804

Correspondence: ² Corresponding author: chofacre{at}uga.edu

This study was performed to determine if the enteric disease necrotic enteritis results in higher shedding of Salmonella. Fifty percent of the chicks per pen were challenged with a naladixic acid-resistant Salmonella Heidelberg. A necrotic enteritis challenge model using a coccidia vaccine to induce intestinal epithelium damage was used to demonstrate that neither the disease necrotic enteritis nor the control of that disease with the antibiotic bacitracin methylene disalycilate had an effect on the incidence of Salmonella Heidelberg. However, the feed additive 3-nitro-4-hydroxyphenylarsonic acid, which controls the cecal coccidia Eimeria tenella, significantly reduced the amount of Salmonella Heidelberg in the environment of the chick as measured by dragswabs and also reduced the number of ceca positive in the contact chicks.

Key Words: Salmonella • necrotic enteritis • roxarsone • bacitracin

¹ The use of trade names in this publication does not imply endorsement by the University of Georgia of the products mentioned nor criticism of similar products not mentioned.