[Hygienic problems encountered in the production and utilization of meat meal and bone meal as well as of silage from animal raw material (author's transl)].

The effect of the dry heat treatment in carcase disposal is dealt with in the light of the data on ther thermal resistance of spore-forming bacteria. The sources of recontamination in the carcass processing plants have been established on the basis of the microbiological examination of samples taken from the environment of these plants and from the end-product of seven plants. The results are compiled in tables. Standard values were established for the analyses of meat meal and bone meal. The main processes for the production of silage from animal raw material are described and illustrated with the help of a table containing typical results of analysis. Hygienic aspects of the silage production as well as the tenacity of micro-organisms and the possibilities of microbial and enzymatic activities are elucidated and supported by tables. Some basic principles for the culturing of the bacteria responsible for the gas-formation in the silage are briefly dealth with.