Effect of Direct-Fed Microbial Dosage on the Fecal Concentrations of Enterohemorrhagic Escherichia coli in Feedlot Cattle.
Foodborne Pathog Dis
; 13(4): 190-5, 2016 Apr.
Article
en En
| MEDLINE
| ID: mdl-26974651
ABSTRACT
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 10(9) Propionibacterium freudenreichii and 10(6) 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 10(9) P. freudenreichii and 10(9) 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.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Enfermedades de los Bovinos
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Probióticos
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Infecciones por Escherichia coli
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Escherichia coli Enterohemorrágica
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Heces
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Fenómenos Fisiológicos Nutricionales de los Animales
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Antibacterianos
Límite:
Animals
País/Región como asunto:
America do norte
Idioma:
En
Revista:
Foodborne Pathog Dis
Asunto de la revista:
CIENCIAS DA NUTRICAO
/
MICROBIOLOGIA
/
PARASITOLOGIA
Año:
2016
Tipo del documento:
Article