J. Appl. Poult. Res.
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J APPL POULT RES 2001. 10:121-127
© 2001 Poultry Science Association
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Research Reports

Changes in Turkey Intestinal Tract Bacteria Associated with Dietary Change from Monensin to Bacitracin, Virginiamycin, or Bambermycin

S. E. Craven, N. A. Cox, M. E. Berrang and N. J. Stern

USDA, Agricultural Research Service, Russell Research Center, Poultry Microbiological Safety Research Unit, P. O. Box 5677, Athens, GA 30604-5677; Phone: (706) 546-3986; FAX: (706) 546-3772

T. S. Cummings

Poultry Business Team, Pfizer Animal Health, HC69, Box 984, White Sulphur Springs, WV 24986

Correspondence: S. E. Craven, E-mail:scraven{at}saa.ars.usda.gov

In a field trial involving commercial turkeys whose feed was changed at 77 d of age from one containing monensin to one containing bacitracin, the intestinal counts for total aerobic bacteria, enterobacteriaceae, lactobacilli, total anaerobic bacteria, and clostridia were similar at flock ages of 28 to 91 d. At 109 to 120 d, the numbers of lactobacilli and clostridia, but not of the other bacterial groups, were higher. In another trial, turkeys were maintained on feed with monensin until the age of 56 d. They were then given feed containing no antimicrobial, monensin as before, or a growth-promoting antibiotic: virginiamycin, bambermycin (Flavomycin), or bacitracin. Bacterial numbers in the intestinal contents of birds killed 1 d before and 1, 3, 7, or 16 d after the change varied with bacterial group, intestinal site, and time after feed change. These changes were transient and not widespread. The numbers for each bacterial group were similar in birds given feed containing the growth-promoting antibiotics.

Key Words: Clostridia • enterobacteriaceae • growth-promoting antibiotics • lactobacilli • monensin • total aerobic bacteria • total anaerobic bacteria • turkey feed






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