The authors applied the ensiling method in a new way for wet conservation of autoclaved slaughter-house by-products of high protein and fat content. The method used is based on the addition of lactic acid bacteria and fermentable carbohydrates to minced and autoclaved by-products, and then the slurry having 30-40 percent dry matter is fermented at 37 degree C for at least two days. After 3-4 days of storage approximately 3-5 percent lactic acid is formed and the conserved slurry can be stored for months in tanks (in anaerobic conditions) without any deterioration. The preserved 'meat pulp', when necessary can be mixed with other feed components and can be stored in containers for 3-5 days before feeding or can be fed directly after mixing of the appropriate components. The preservation method is suitable for processing the perished farm animals as well.