Buffers between grazing sheep and leafy crops augment food safety

Bruce R. Hoar, Edward R Atwill, Lesa Carlton, Jorge Celis, Jennifer Carabez, Tran Nguyen

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The presence of livestock in or near fresh-market vegetable fields has raised concerns about the potential for contaminating produce with pathogenic bacteria. To develop buffer zones for grazing near production of leafy greens, we assessed the prevalence of Escherichia coli O157:H7 and Salmonella species in sheep that were grazed on alfalfa fields during the winter in California's Imperial Valley. We found E. coli O157:H7 in 1.8% of fecal samples and 0.4% of soil samples, and Salmonella in 0.8% of fecal samples and 0.4% of soil samples. Our results indicate that sheep grazing on alfalfa in the Imperial Valley have a low prevalence of these pathogens in their feces and that these bacteria are rarely found in soil from fields with grazing sheep. The California Leafy Green Products Handler Marketing Agreement guideline of 30 feet between grazing lands or domestic animals and the crop edge is adequate to minimize potential contamination of nearby crops.

Original languageEnglish (US)
Pages (from-to)104-109
Number of pages6
JournalCalifornia Agriculture
Volume67
Issue number2
DOIs
StatePublished - Apr 2013

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food safety
sheep
buffers
grazing
green leafy vegetables
Escherichia coli O157
crop
alfalfa
Salmonella
crops
valleys
soil sampling
grazing lands
fresh market
bacteria
domestic animals
valley
bacterium
marketing
soil

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science
  • Forestry

Cite this

Buffers between grazing sheep and leafy crops augment food safety. / Hoar, Bruce R.; Atwill, Edward R; Carlton, Lesa; Celis, Jorge; Carabez, Jennifer; Nguyen, Tran.

In: California Agriculture, Vol. 67, No. 2, 04.2013, p. 104-109.

Research output: Contribution to journalArticle

Hoar, BR, Atwill, ER, Carlton, L, Celis, J, Carabez, J & Nguyen, T 2013, 'Buffers between grazing sheep and leafy crops augment food safety', California Agriculture, vol. 67, no. 2, pp. 104-109. https://doi.org/10.3733/ca.v067n02p104
Hoar, Bruce R. ; Atwill, Edward R ; Carlton, Lesa ; Celis, Jorge ; Carabez, Jennifer ; Nguyen, Tran. / Buffers between grazing sheep and leafy crops augment food safety. In: California Agriculture. 2013 ; Vol. 67, No. 2. pp. 104-109.
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