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A possible method for interpreting data generated in rat free-choice bioassays with anticoagulatn rodenticides is described. The method allows a greater freedom in interpretation of parameters of efficacy but has a slight problem in differences in bait acceptance by male and female rats. Basically, analysis is a simple one-tailed t-test comparing percent bait acceptance with a cutoff point. The use of the method is demonstrated with authentic data developed by the U.S. Environmental Protection Agency.
Rattus norvegicus, test data analysis, efficacy test, vertebrate pest control, anticoagulants, rodenticides, rats
Supervisory biologist, Terrestrial and Aquatic Biology Unit, U.S. Environmental Protection Agency, Beltsville, Md.