[Foreign substances in the meat and organs of bulls fed on a diet of swine and poultry fecal waste].

The meat and some organs of eight bulls given diet with 5% to 15% supplements of dried pig and poultry excrements for 175 days were subjected to examination for the presence of some foreign substances. The results were compared with samples from eight control bulls, fed the basal diet. Liver was not found to contain any aflatoxins B1 and M1. No statistically significant differences were found in the content of antimicrobial substances. The same can be said of the content of chlorinated pesticides. Residues of organo-phosphorus pesticides were not detected at all. As to chemical elements, the test bulls were found to have a significantly increased content of copper in liver and diaphragm. All the findings of the residues of foreign substances were within limits tolerated by veterinary regulations.