Domestic animals on adjacent land present a food safety risk if there is a chance of wind or runoff spreading fecal matter to produce fields. When assessing risks to your farm, some factors to consider are whether physical barriers are present (fencing, ditches, berms), location of crop field (uphill, downhill) from animal grazing area, number of animals present, and the likelihood of runoff and wind spread. Some research suggests a 30 foot buffer is sufficient to protect produce crops from animals grazing on vegetated land. Remember, if you farm with horses or use other animals during production, there should be a plan for their presence in the field, especially close to harvest. See the Wildlife and Animal Management Decision Tree for more specific recommendations.
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The LSU AgCenter and the LSU College of Agriculture