Primary poisoning risk for encapsulated sodium nitrite, a new tool for pest control
2017
Shapiro, Leland | Aylett, Paul | Arthur, Donald | Eason, Charles
Acute toxicity of sodium nitrite (NaNO₂) was assessed in chickens (Gallus gallus domesticus) and domestic mallard ducks (Anas platyrhynchos domestica) by oral gavage and in free-feeding trials with chickens, domestic mallard ducks, pigeons (Columba livia f. domestica), budgerigars (Melopsittacus undulates) and wētā (Family: Rhaphidophoridae). Free-feeding trials involved the presentation of toxic paste and pellet baits containing encapsulated NaNO₂ developed for the control of common brushtail possums (Trichosurus vulpecula) and feral pigs (Sus scrofa). The oral gavage LD₅₀ value for NaNO₂ in solution was approximately 68.50 mg/kg (95% CI 55.00–80.00 mg/kg) for both chickens and ducks. In feeding trials, six out of 12 chickens consumed toxic paste bait and four of these birds consumed a lethal dose. When chickens consumed toxic paste bait, the LD₅₀ value was approximately 254.6 mg/kg (95% CI 249.1–260.2 mg/kg). Of the other three species of birds presented with toxic baits only one duck consumed a lethal dose of paste bait. There was no evidence of wētā feeding on toxic baits.
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