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P2-37 The Effect of Preharvest Feeding Strategies on the Prevalence of Salmonella enterica in the Feces and Trimmings of Feedlot Cattle

Tuesday, July 11, 2017
Exhibit Hall (Tampa Convention Center)
Katlyn Holzer , Colorado State University , Ft Collins , CO
Carla Weissend , Colorado State University , Ft Collins , CO
Jennifer Martin , Department of Animal Sciences, Colorado State University , Fort Collins , CO
Kate Huebner , Colorado State University , Ft Collins , CO
Ifigenia Geornaras , Department of Animal Sciences, Colorado State University , Fort Collins , CO
Paul Morley , Colorado State University , Ft Collins , CO
Keith Belk , Department of Animal Sciences, Colorado State University , Fort Collins , CO
Introduction: There is pressure in agriculture to reduce the use of antimicrobials in livestock production. Tylosin, a macrolide antimicrobial, is commonly used for prevention of liver abscesses in cattle. As macrolides are important to human medicine, efforts are being made to reduce their use in agriculture. Natural compounds have shown promise as alternatives for macrolides in beef finishing diets and their impact on pathogen prevalence in the beef supply chain is worthy of investigation.

Purpose: This study evaluated the influence of including naturally-derived feed additives in beef cattle finishing diets on the presence of Salmonella enterica in feces and beef trimmings.

Methods: Commercial cattle in northern Texas (n=5,481 head) were randomly assigned to one of four treatment groups with 10 pen blocks per treatment. The finishing ration treatment groups included (i) with tylosin; (ii) without tylosin; (iii) without tylosin, but with an essential oil (CRINA-L; source of limonene); and (iv) without tylosin but with a yeast fermentation byproduct. Pen-floor fecal samples were collected from each pen. Finished cattle were harvested at a commercial processing facility and trimmings were collected from each pen at fabrication. Salmonella enterica was isolated from composite fecal and trim samples using standardized methodologies.

Results: Thirty-eight of the 40 fecal samples (95%) and, as expected for this region, 11 of 36 composited trimmings samples (31%) were positive for Salmonella. Fecal Salmonella prevalence did not differ among treatment groups (P>0.05). No correlation existed between fecal sample positives for Salmonella and trimmings samples that also were positive for Salmonella.

Significance: As alternatives for antibiotics in finishing cattle diets are explored, their influence on pathogen presence in the beef supply chain is important. These data suggest that inclusion of yeast fermentation extracts or essential oils in finishing rations has little influence on the presence of Salmonella in feces or trimmings.

Back to: Poster Session 2 – Food Chemical Hazards and Food Allergens, Food Toxicology, Meat, Poultry and Eggs, Epidemiology, Retail and Food Service Safety, Communication Outreach and Education, Molecular Analytics, Genomics and Microbiome, Laboratory and Detection Methods, and Dairy
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