Studies on rodenticides (II) : Feeding preference of Norway rat on poison baits with acute rodenticides and their killing effects

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  • 殺そ剤に関する研究 II : 急性毒剤のドブネズミによる摂食性および効力について
  • 殺そ剤に関する研究-2-急性毒剤のドブネズミによる摂食性および効力について
  • サッソザイ ニ カンスル ケンキュウ 2 キュウセイ ドクザイ ノ ドブネズミ ニ ヨル セッショクセイ オヨビ コウリョク ニ ツイテ

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1. The feeding preference of Norway rats, Rattus norvegicus, on poison baits with 4 acute rodenticides, i. e. norbormide, scilliroside, zinc phosphide and thallium sulfate, as well as the killing effect of these rodenticides, was studied in a laboratory. 2. Rats showed poor feeding preference on dry baits with 1% norbormide, resulting in a low mortality of the rats. They appeared to be remarkably shy to the baits of norbormide as high as 0.5% of the toxicant, though only slightly shy to 0.25% baits. Raw sweet potato baits with 1% norbormide were preferred to the dry baits, causing a higher mortality of them. The rats which consumed the dry baits showed rapidly the sign of intoxication. The killing effects of norbormide showed much variation, which was shown by the fact that doses of the toxicant taken by the rats killed and by the survivors were similar; the former 33-100mg/kg and the latter 27-147mg/kg. 3. With 0.017% scilliroside dry baits, rats did not take lethal dose, probably because of their shyness to such a higher concentration of the toxicant. They seemed to show shyness, if the concentration in dry baits is higher than 0.083%. Raw sweet potato baits with 0.017% scilliroside were prefered to the dry baits, causing a higher mortality of them. The rats which consumed a lethal dose of scilliroside were killed 1 to 4 days after feeding. Doses of scilliroside taken by the rats killed were 1.4-4.5mg/kg, and by the survivors were 0.3-1.9mg/kg. 4. With 1% zinc phosphide dry baits, rats did not take lethal dose, probably because of their shyness to such a higher concentration of the toxicant. The action of zinc phosphide was rapid, but its effects were manifested with much variation. Doses of zinc phosphide taken by the rats killed were 65-143mg/kg, and by the survivors were 69-330mg/kg. 5. Rats preferred both dry baits and raw sweet potato baits with thallium sulfate, showing a higher mortality. Shyness to the dry baits was not shown, if the concentration of the toxicant was as low as 0.15%, though they were slightly shy to 0.3% baits. The action of thallium sulfate was slowly manifested; the killing effects appeared 2-5 days after feeding. Doses of thallium sulfate taken by the rats killed were 41-187mg/kg.

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