Oral Toxicity Studies with Heptachlor and Heptachlor Epoxide in Young Calves

Opinion of the Scientific Panel on contaminants in the food chain [CONTAM] related heptachlor as an undesirable substance in animal feed

“…died and the other two recovered after severe neurological symptoms. Buck et al (1959) treated orally single 1 -2 week old calves with heptachlor at 2.5, 5 or 10 mg/kg b.w. per day.…”