Abstract
Lead levels were determined in organs of sheep exposed to lead pollution from automotive exhaust emissions. In three experiments involving (a) sheep grazed near busy highways, (b) sheep kept away from emissions but fed with contaminated grass and (c) sheep exposed to emissions but fed with uncontaminated grass, considerable accumulation of lead was observed in livers, kidneys (cortex) and bones. Highest concentrations of lead in lungs were observed for sheep exposed to traffic but fed with uncontaminated grass. Six months after removal from a source of lead pollution, the lead content of soft organs of sheep had approached, but not reached, background levels. The lead content of bones had not changed appreciably in this time. Edible muscle tissue showed only slight accumulation of lead. It is suggested that offal of animals grazed adjacent to highways should be discarded because of the risk of its finding its way into pet foods which are sometimes consumed by humans.
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