Toxicity of Experimental Lead-Iron Shot versus Commercial Lead Shot in Mallards

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Abstract
The toxicity of an experimental Pb-Fe shot containing 38.1% Pb was compared with commercial Pb shot in mallard ducks (Anas platyrhynchos) fed corn for 14 wk. Significantly higher mortality occurred in ducks dosed with commercial Pb shot compared to ducks given Pb-Fe shot containing comparable amounts of Pb. Loss of body weight was indicative of the difference in toxicity of the 2 types of shot. Mortality was dose-related in ducks given commercial Pb shot; one no. 8 shot (73 mg Pb) caused 35% mortality with higher amounts of Pb causing 80-100% mortality. Ingestion of up to 2 no. 4 Pb-Fe shots (111 mg Pb) caused no significant weight loss and only 5% mortality. Ducks dosed with 5 Pb-Fe shot suffered 45% mortality and those given 16 shot 50% mortality.

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