TY - JOUR
T1 - Effect of Direct-Fed Microbial Dosage on the Fecal Concentrations of Enterohemorrhagic Escherichia coli in Feedlot Cattle
AU - Luedtke, Brandon E.
AU - Bosilevac, Joseph M.
AU - Harhay, Dayna M.
AU - Arthur, Terrance M.
N1 - Publisher Copyright:
© Copyright 2016, Mary Ann Liebert, Inc. 2016.
PY - 2016/4/1
Y1 - 2016/4/1
N2 - Contamination of beef products by Shiga toxin-producing Escherichia coli is a concern for food safety with a particular subset, the enterohemorrhagic E. coli (EHEC), being the most relevant to human disease. To mitigate food safety risks, preharvest intervention strategies have been implemented with the aim to reduce EHEC in cattle. One class of interventions that has been widely used in feedlots is direct-fed microbials (DFMs), which can contain various dosing rates of probiotic bacteria. Here we compare the use of two different doses of a commercially available DFM on total EHEC load in a commercial feedlot setting. The DFMs used were the standard 109 Propionibacterium freudenreichii and 106 Lactobacillus acidophilus colony forming units (CFUs)/head/day dose of Bovamine® (Nutrition Physiology Company, Guymon, OK) and the higher dose, Bovamine Defend™ (Nutrition Physiology Company), which is dosed at 109 P. freudenreichii and 109 Lactobacillus acidophilus CFUs/head/day. To analyze the total EHEC fecal concentration, 2200 head of cattle were assigned a DFM feed regimen lasting approximately 5 months. At harvest, 480 head of cattle were sampled using rectoanal mucosal swabs. A quantitative polymerase chain reaction assay targeting ecf1 was used to enumerate the total EHEC fecal concentration for 240 head fed the low-dose DFM and 240 head fed the high-dose DFM. No significant difference (p > 0.05) in the fecal concentration of total EHEC was observed between the two doses. This suggests that using an increased dosage provides no additional reduction in the total EHEC fecal concentration of feedlot cattle compared to the standard dosage.
AB - Contamination of beef products by Shiga toxin-producing Escherichia coli is a concern for food safety with a particular subset, the enterohemorrhagic E. coli (EHEC), being the most relevant to human disease. To mitigate food safety risks, preharvest intervention strategies have been implemented with the aim to reduce EHEC in cattle. One class of interventions that has been widely used in feedlots is direct-fed microbials (DFMs), which can contain various dosing rates of probiotic bacteria. Here we compare the use of two different doses of a commercially available DFM on total EHEC load in a commercial feedlot setting. The DFMs used were the standard 109 Propionibacterium freudenreichii and 106 Lactobacillus acidophilus colony forming units (CFUs)/head/day dose of Bovamine® (Nutrition Physiology Company, Guymon, OK) and the higher dose, Bovamine Defend™ (Nutrition Physiology Company), which is dosed at 109 P. freudenreichii and 109 Lactobacillus acidophilus CFUs/head/day. To analyze the total EHEC fecal concentration, 2200 head of cattle were assigned a DFM feed regimen lasting approximately 5 months. At harvest, 480 head of cattle were sampled using rectoanal mucosal swabs. A quantitative polymerase chain reaction assay targeting ecf1 was used to enumerate the total EHEC fecal concentration for 240 head fed the low-dose DFM and 240 head fed the high-dose DFM. No significant difference (p > 0.05) in the fecal concentration of total EHEC was observed between the two doses. This suggests that using an increased dosage provides no additional reduction in the total EHEC fecal concentration of feedlot cattle compared to the standard dosage.
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U2 - 10.1089/fpd.2015.2063
DO - 10.1089/fpd.2015.2063
M3 - Article
C2 - 26974651
AN - SCOPUS:84964573694
SN - 1535-3141
VL - 13
SP - 190
EP - 195
JO - Foodborne pathogens and disease
JF - Foodborne pathogens and disease
IS - 4
ER -