| Autor: |
Dornbach, Colten W, Hales, Kristin E, Gubbels, Erin R, Wells, James E, Hoffman, Ashley A, Hanratty, Ashlee Noelle, Line, Dalton J, Smock, Taylor M, Manahan, Jeff L, McDaniel, Zach S, Kohl, Kesley B, Burdick Sanchez, Nicole C, Carroll, Jeffery A, Rusche, Warren C, Smith, Zachary K, Broadway, Paul R |
| Zdroj: |
Journal of Animal Science; November 2023, Vol. 101 Issue: 1, Number 1 Supplement 3 p84-85, 2p |
| Abstrakt: |
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. colipopulations. Yearling heifers (n = 190) were utilized in a 2 × 2 factorial arrangement. Heifers (n = 98) in the northern region were sourced from South Dakota (SD) while heifers (n = 92) in the southern region were sourced from Texas (TX). After feedlot arrival in each respective region, fecal Salmonella prevalence was determined, and heifers were sorted into 1 of 4 treatments: heifers sourced from SD and finished in SD (SD-SD); heifers sourced from SD and finished in TX (SD-TX); heifers sourced from TX and finished in SD (TX-SD); heifers sourced from TX and finished in TX (TX-TX). Transport for SD-TX and TX-SD heifers occurred on d 0. 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 (d 78 for heifers finished in TX and d 90 for heifers finished in SD). 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. The TX-SD heifers had a 72% decrease in Salmonellaprevalence from d 1 to harvest, whereas the SD-TX heifers had a 2,200% increase in Salmonellaprevalence from d 1 to harvest. 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. coliO157: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. coliO157: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. |
| Databáze: |
Supplemental Index |
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