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The results of testing dry anticoagulant baits at the Animal Biology Laboratory are evaluated in this paper. Overall, 14,940 rats were committed to these tests resulting in a mortality rate of 91 . 8 percent. The five chemicals tested and their mean mortality per test are: Diphacinone (93.5 percent), Pival (87.5 percent), Warfarin (93.9 percent), Prolin (91.2 percent), and Fumarin (92.8 percent). The data indicates that 77.4 percent of the tests conducted resulted in a mortality of 90 percent or greater, but only 11.9 percent of them resulted in acceptance of 33 percent or greater and mortality of 90 percent or greater.