International Journal of Recycling of Organic Waste in Agriculture (IJROWA) Effect of composting on the microbiological and parasitic load in animal production wastes in Brazil Volume 10 (2021) Issue 3, September 2021 2024 01 18 Effect of composting on the microbiological and parasitic load in animal production wastes in Brazil 10.30486/ijrowa.2021.1909128.1132 EN Paula Fernanda Alves Ferreira Department of Veterinary Microbiology and Immunology, Veterinary Institute, Federal Rural University of Rio de Janeiro, 23897-970, Seropédica, Rio de Janeiro, Brazil 0000-0001-7533-1216 Júlia Ferreira Xavier Department of Veterinary Microbiology and Immunology, Veterinary Institute, Federal Rural University of Rio de Janeiro, 23897-970, Seropédica, Rio de Janeiro, Brazil 0000-0002-8609-1825 Danielli Monsores Bertholoto Department of Veterinary Microbiology and Immunology, Veterinary Institute, Federal Rural University of Rio de Janeiro, 23897-970, Seropédica, Rio de Janeiro, Brazil 0000-0002-4560-4567 Dayanne Araújo De Melo Department of Veterinary Microbiology and Immunology, Veterinary Institute, Federal Rural University of Rio de Janeiro, 23897-970, Seropédica, Rio de Janeiro, Brazil 0000-0002-3634-7220 Thaís Ribeiro Correia Department of Animal Parasitology, Veterinary Institute, Federal Rural University of Rio de Janeiro, 23897-970, Seropédica, Rio de Janeiro, Brazil 0000-0003-3045-8787 Dayanne Araújo De Melo Department of Veterinary Microbiology and Immunology, Veterinary Institute, Federal Rural University of Rio de Janeiro, 23897-970, Seropédica, Rio de Janeiro, Brazil 0000-0002-3634-7220 Miliane Moreira Soares De Souza Department of Veterinary Microbiology and Immunology, Veterinary Institute, Federal Rural University of Rio de Janeiro, 23897-970, Seropédica, Rio de Janeiro, Brazil 0000-0001-8325-9322 Marco Antônio Leal Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA), Seropédica-Rio de Janeiro, Brazil 0000-0003-3988-2277 Ednaldo Da Silva Araújo Brazilian Agricultural Research Corporation, Embrapa Agrobiology, 23891-000, Seropédica, Rio de Janeiro, Brazil 0000-0003-1357-2529 Ednaldo Da Silva Araújo Brazilian Agricultural Research Corporation, Embrapa Agrobiology, 23891-000, Seropédica, Rio de Janeiro, Brazil 0000-0003-1357-2529 Journal Article 2024 01 18 Purpose Animal production wastes are promising for use in agricultural production as a plant nutrient or soil conditioner. However, if not properly managed, they can contaminate the soil and plants, resulting in public health risks. Considering that the composting technique is recommended to ensure compost hygiene and agronomic viability, the present study aimed to evaluate the microbiological and parasitic load during the composting of residues from conventional and organic animal productions. Method The presence of Salmonella sp. and/or helminth eggs and the quantification of thermotolerant coliforms were determined in horse bedding and organic and conventional poultry litter during the process of composting. Results The initial load of thermotolerant coliforms was greater than 1017 MPN g-1 in the three raw materials. All of them showed a significant reduction in these bacteria at the end of the composting process, reaching 99.98%, 100.00%, and 99.80% in the horse bedding, organic poultry litter, and conventional poultry litter, respectively. All the fresh residues contained helminth eggs, with the horse bedding exhibiting the highest amount compared to the others. However, they all revealed an absence of helminth eggs at the end of the composting process. Salmonella sp. was absent in both the raw materials and the final compost. Conclusion Composting was effective in eliminating helminth eggs and reducing thermotolerant coliform levels. However, the final composts retained a higher pathogenic microbial load than that required by the current Brazilian legislation for use in agriculture.