Abstract
Gray rats occupy a significant share in the number of synanthropes living next to humans. The fight against them is difficult, due to their high adaptability, as well as the risk of poisoning of non-target wild and domestic animals. Insufficiently organized deratization measures lead to an increase in the number of rodent populations and their settlement of new adjacent territories. Gray rats belong to the species of mouse-like rodents resistant to the action of many factors, including developing resistance to the effects of rodenticidal baits based on anticoagulants. Experimental studies have shown that the eating of at least 50 % of the daily requirement of baits containing 0,005 and 0,0025 % of the concentration of DV bromadiolone by gray rats during one day can cause 1 % death. When analyzing the results obtained when feeding baits, it was found that for the death of gray rats, the maximum dose was 100 mg/ kg, and the minimum was 6,88 mg/kg. Gray rats in conditions of free access to food and bait can consume up to 0,7 g of rodenticidal agent to achieve a lethal effect, but it will be enough for individuals to eat about 40 g for this.
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