Pig manure can be a good fertilizer for plants. However, due to the risk of pathogens that cause food borne illness in humans, experts do not recommend the use of pig manure to fertilize vegetable gardens.
Pig manure can contain harmful bacteria, such as E. coli, salmonella and listeria. These pathogens can transfer to humans through direct contact with the manure and fresh fruit and vegetables. The risk of contamination can be reduced by composting the manure at a temperature of 140 degrees or higher and by applying manure to the soil at least 120 days before harvesting fruit or vegetables; however, experts warn that pig manure carries a higher risk of pathogens surviving through these types of precautionary measures than other types of manure.