Fecal Shedding of Salmonella spp. by Dairy Cows on Farm and at Cull Cow Markets

Author:

WELLS S. J.1,FEDORKA-CRAY P. J.2,DARGATZ D. A.3,FERRIS K.4,GREEN A.3

Affiliation:

1. 1Department of Clinical and Population Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul, Minnesota 55108

2. 2Richard Russell Research Center, U.S. Department of Agriculture, Agricultural Research Service, Athens, Georgia 30605-2720

3. 3Centers for Epidemiology and Animal Health, U.S. Department of Agriculture, Animal and Plant Health Inspection Service, Veterinary Services, Ft. Collins, Colorado 80521

4. 4National Veterinary Services Laboratories, U.S. Department of Agriculture, Animal and Plant Health Inspection Service, Veterinary Services, Ames, Iowa 50010, USA

Abstract

As part of a national study of the U.S. dairy cow population, fecal samples were collected from representative cows on 91 dairies and 97 cull dairy cow markets in 19 states. Salmonella spp. were recovered from 5.4% of milk cows, 18.1% of milk cows expected to be culled within 7 days, and 14.9% of culled dairy cows at markets. On a premise basis, Salmonella shedding in milk cows was detected on 21.1% of dairies and 66% of cull dairy cow markets. The percentage of herds with at least one cow with detectable Salmonella fecal shedding was higher during the sampling period from May through July, in herds with at least 100 milk cows, and in herds in the South region. The most common Salmonella serogroups isolated were E (30.8% of isolates) and C1 (28.6%); the most common serotypes isolated were Salmonella Montevideo (21.5% of isolates), Salmonella Cerro (13.3%), and Salmonella Kentucky (8.5%). Fecal shedding of Salmonella Typhimurium or Salmonella Typhimurium var. copenhagen was infrequent (2.8% of isolates). Most isolates (88.9%) were susceptible to all 17 antimicrobials evaluated; multiple resistance was an infrequent occurrence. This study provides information describing the distribution of Salmonella fecal shedding from dairy cows on farm and at markets and will serve as a baseline for future studies.

Publisher

International Association for Food Protection

Subject

Microbiology,Food Science

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