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Relative Toxicity of Lead and Selected Substitute Shot Types to Game Farm Mallards

Harold D. Irby, Louis N. Locke and George E. Bagley
The Journal of Wildlife Management
Vol. 31, No. 2 (Apr., 1967), pp. 253-257
Published by: Wiley on behalf of the Wildlife Society
DOI: 10.2307/3798314
Stable URL: http://www.jstor.org/stable/3798314
Page Count: 5
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Relative Toxicity of Lead and Selected Substitute Shot Types to Game Farm Mallards
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Abstract

The acute toxicity of lead, three types of plastic-coated lead, two lead--magnesium alloys, iron, copper, zinc-coated iron, and molybdenum-coated iron shot were tested in year-old male game farm mallards. Mallards (Anas platyrhynchos) were fed eight number 6 shot of each type and observed for a period of 60 days. Ducks used totaled 230 and most shot types were tested in three replicates of 8 ducks each. Mortality and losses of body weight were the criteria used for judging toxicity. Three types of plastic-coated lead shot were as toxic (93 percent) as the commercial lead shot (96 percent). The average mortality in mallards fed lead--magnesium alloy shot was less (58 percent) than that occurring in birds fed commercial lead shot. Mortality among mallards fed iron, copper, zinc-coated iron or molybdenum-coated iron shot was significantly less than in birds fed lead shot, and was not significantly greater than the conrtols.

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