Slaughterhouse waste are mainly disposed of by incineration, which generates pollution  and greenhouse gases. Conversely, these wastes could be recovered are a source of useful biological resources. This study was carried out in 2024 at the wilayas of Skikda. We carried out the treatment of each poultry by-product (legs, viscera, heads and feathers) by cooking at a temperature of 120°C; nevertheless; the cooking time was different for each by-product; In order to valorize the waste generated and identify its value, we carried out an analysis of the flour physicochemical for four type of by-products. The samples were processed for bacterial analysis such as total coliforms, faecal coliforms, faecal streptococci and, Salmonella. The findings revealed that the protein content analysis indicated that feathers contain the highest protein content (88.2%), followed by other waste components (51-52%).The analysis also revealed considerable concentrations of minerals (3.86%) for viscera, (13.02%) for legs, (12.37%) for heads and (1.24%) for feathers. The lack of microbiological risk associated with their use has been proven. Good efficiency resulting from the use of waste materials, as well as limiting the negative impact of poultry farms on the environment, make this solution an attractive alternative.