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acceptance and mortality Alcolec Amount of bait bait carrier Bait development bioassays bait distribution bait spots bait was applied black-footed ferrets black-tailed prairie dogs concentration of zinc contamination control methods Corn oil Low Cynomys ludovicianus evaluated exclosures field trials formulated g per burrow g per day grain bait Groats Corn oil guinea fowl hazards to nontarget Horned larks Initial bait acceptance LD50 doses Lewistown low application rate low rate Low s Yes mg/kg Mustela National Wildlife Range nontarget species Okuno post-treatment prairie dog activity prairie dog colonies prebait and bait primary and secondary rangeland record the number reference colonies rodenticide Rolled Corn oil rolled oat Russell National Wildlife Secondary Hazard Bioassays secondary poisoning steam-rolled oats strychnine Table test animals thallium toxic Tr'd Groats Corn Tr'd Rolled Corn treated colonies treated oats treatment trial was conducted Wildlife Research Center zinc phosphide bait zinc phosphide residues zinc phosphide-killed zinc phosphide-treated oats