Water troughs in the lairages of three bacon factories were examined. Pigs were observed drinking from the troughs, some of which were contaminated with faeces. Some of the troughs contained detectable concentrations of sulphadimidine, and the highest concentration recorded was 17 micrograms/ml. Pigs which drank this contaminated water before slaughter could contain tissue residues of sulphadimidine above the permitted concentration.
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