Systematic review of products with potential application for use in the control of <i>Campylobacter </i>spp. in organic and free-range broilers

Campylobacter spp. are some of the most important food-borne zoonoses in Europe and broiler meat is considered the main source of Campylobacter infections. Organic and free-range broilers have access to outdoor reservoirs of Campylobacter and are more frequently infected at slaughter than the conventional broiler flocks. Limitations to biosecurity and treatment options in these production types calls for additional solutions. This review examines intervention methods with sufficient strength and quality, which are able to reduce the load of Campylobacter safely and efficiently and discuss their applicability in organic and free-range broiler production. Four different products passed the inclusion criteria and their quality examined: ferric tyrosine chelate, a prebiotic fermentation product of Saccharomyces cerevisiae, short-chain fatty acid butyrate coated on microbeads added to feed, and a mix of organic acids added to the drinking water. Though potential candidates for reducing Campylobacter in broilers were identified, there is a lack of large scale intervention studies that demonstrate an effect under field conditions of a free-range broiler production. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s13028-022-00644-z

Additional file 2 of Systematic review of products with potential application for use in the control of Campylobacter spp. in organic and free-range broilers

Additional file 2. Descriptors used to evaluate the articles

Additional file 3 of Systematic review of products with potential application for use in the control of Campylobacter spp. in organic and free-range broilers

Additional file 3. Defined criteria based on GRADE guidelines used for quality assessment of studies

Additional file 1 of Systematic review of products with potential application for use in the control of Campylobacter spp. in organic and free-range broilers

Additional file 1. Search strings used in DTU Findit search too to find publications

Additional file 5 of Systematic review of products with potential application for use in the control of Campylobacter spp. in organic and free-range broilers

Additional file 5. Reduction of Campylobacter. List of articles before the final step in the review process (Fig. 1), the tested interventions and the effect of the interventions