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ARS Home » Plains Area » Lubbock, Texas » Cropping Systems Research Laboratory » Livestock Issues Research » Research » Publications at this Location » Publication #402415
Research Project: Environmental and Management Influences on Animal Productivity and Well-Being Phenotypes

Location: Livestock Issues Research

Title: Longitudinal assessment of prevalence and incidence of Salmonella and Escherichia coli O157 resistance to antimicrobials in feedlot cattle sourced and finished in different regions of the U.S

Author
item DORNBACH, COLTEN - Texas Tech University
item HALES, KRISTIN - Texas Tech University
item GUBBELS, ERIN - South Dakota State University
item Wells, James - Jim
item HOFFMAN, ASHLEY - Texas Tech University
item HANRATTY, ASHLEE - Texas Tech University
item LINE, DALTON - Texas Tech University
item SMOCK, TAYLOR - Texas Tech University
item MANAHAN, JEFF - Texas Tech University
item MCDANIEL, ZACHARY - Texas Tech University
item KOHL, KESLEY - Texas Tech University
item Sanchez, Nicole
item Carroll, Jeffery - Jeff Carroll
item RUSCHE, WARREN - South Dakota State University
item SMITH, WARREN - South Dakota State University
item Broadway, Paul

Submitted to: Proceeding of Plains Nutrition Council Symposium
Publication Type: Abstract Only
Publication Acceptance Date: 2/22/2023
Publication Date: 9/1/2023
Citation: Dornbach, C.W., Hales, K.E., Gubbels, E., Wells, J., Hoffman, A.A., Hanratty, A.N., Line, D.J., Smock, T.M., Manahan, J.L., McDaniel, Z.S., Kohl, K.B., Sanchez, N.C., Carroll, J.A., Rusche, W., Smith, W., Broadway, P.R. 2023. Longitudinal assessment of prevalence and incidence of Salmonella and Escherichia coli O157 resistance to antimicrobials in feedlot cattle sourced and finished in different regions of the U.S. Proceeding of Plains Nutrition Council Symposium. p. 98.

Interpretive Summary:

Technical Abstract: The objective was to investigate the influence of cattle origin and region of finishing on the prevalence of Salmonella, Escherichia coli O157:H7, and select antimicrobial resistance in E. coli populations. Yearling heifers (n = 190) were utilized in a 2 × 2 factorial arrangement. After determining fecal Salmonella prevalence, heifers were sorted into 1 of 4 treatments: heifers originating from SD and finished in SD (SD-SD); heifers originating from SD and finished in TX (SD-TX); heifers originating from TX and finished in SD (TX-SD); heifers originating from TX and finished in TX (TX-TX). Fecal, pen, and water scum line (WSL) samples were collected longitudinally throughout the study; hide and subiliac lymph node (SLN) samples were collected at study end. A treatment × time interaction was observed (P = 0.01) for fecal Salmonella prevalence, with prevalence being greatest for TX-TX and TX-SD heifers before transport. From d 14 through study end, prevalence was greatest for TX-TX and SD-TX heifers compared with SD-SD and TX-SD heifers. Salmonella prevalence on hides were greater (P = 0.01) for heifers finished in TX compared with SD. Salmonella prevalence in SLN tended (P = 0.06) to be greater in TX-TX and SD-TX heifers compared with TX-SD and SD-SD. Fecal E. coli O157:H7 prevalence had a treatment × time interaction (P = 0.04), with SD-TX prevalence being greater than TX-SD on d 56 and SD-SD and TX-TX being intermediate. A treatment × time interaction was observed for fecal trimethoprim-sulfamethoxazole-resistant and cefotaxime-resistant E. coli O157:H7 prevalence (P = 0.01). Overall, these data suggest region of finishing influences pathogenic bacterial shedding patterns, with the initial 14 d after feedlot arrival being critical for pathogen carriage.