title: Effects of broiler feed medications on Salmonella.
abstract: This pilot analysis was conducted with data from 52 conventional grow-out broiler flocks in a prospective field observational study in the southeastern United States during 2003-2006. Each flock was sampled for Salmonella 1 wk before the end of grow-out, upon arrival at the processing plant, and during processing (prior to and immediately after carcass chilling). The broiler litter was sampled on the day of bird harvest. The grow-out feeding programs, including the medications delivered in feed, were surveyed with questionnaires completed by the broiler managers and feedmill managers. Each detail of the feeding program was tested for statistical association with the frequency of Salmonella in the flock at each sampling point, after accounting for variation in Salmonella frequency between the farms, broiler complexes, and companies. Significant associations were found between Salmonella frequency in the broiler flock pre- and postharvest and the inclusion of feeds containing individual coccidiostats and other antimicrobial growth promoters, days on feed, and total consumption of feeds containing these products, as well as with practices such as a mash feed and a nonmedicated withdrawal feed. The analysis provided testable hypotheses for how broiler feed medications impact the frequency of Salmonella in the flocks.
authors.affiliation: Department of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, P.O. Box 6100, Mississippi State, MS 39759, USA. vv87@cornell.edu
authors.forename: Victoriya V
authors.initials: VV
authors.lastname: Volkova
authors.forename: Sue Ann
authors.initials: SA
authors.lastname: Hubbard
authors.forename: Danny L
authors.initials: DL
authors.lastname: Magee
authors.forename: J Allen
authors.initials: JA
authors.lastname: Byrd
authors.forename: Richard H
authors.initials: RH
authors.lastname: Bailey
authors.forename: Robert W
authors.initials: RW
authors.lastname: Wills
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000818:Animals; D000890:Anti-Infective Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D002645:Chickens; D015169:Colony Count, Microbial / Q000662:veterinary; D004783:Environmental Microbiology; D010865:Pilot Projects; D011201:Poultry Diseases / Q000188:drug therapy* / Q000453:epidemiology / Q000382:microbiology; D015995:Prevalence; D011446:Prospective Studies; D012475:Salmonella / Q000187:drug effects* / Q000302:isolation & purification; D012481:Salmonella Infections, Animal / Q000188:drug therapy* / Q000453:epidemiology / Q000382:microbiology; D015144:Southeastern United States / Q000453:epidemiology
chemical_list: D000890:Anti-Infective Agents