Trichlorfon toxicity in pigs.

A field outbreak of suspected poisoning is recorded from feed medicated with the organophosphorus insecticide trichlorfon. A controlled experiment showed that toxicity could occur when trichlorfon was fed from 3-5 days at levels greater than that recommended. Signs recorded were inappetence, muscle tremor, ataxia and deaths. Attention is drawn to conditions which could result in overdosage and toxicity when used on the farm.