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Ecotoxicological information

Toxicity to birds

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Description of key information

The most critical NOEC was a 21-day NOEC of 1 mg Se/kg diet for effect of Se on growth of Gallus domesticus which were fed ad libitum with a selenium contaminated diet in electrically heated battery brooders (Jensen, 1986; Klimisch 2).

Key value for chemical safety assessment

Long-term EC10, LC10 or NOEC for birds:
1 mg/kg food

Additional information

Several studies are available for the long-term toxicity of various Se compounds (selenium, Na2SeO3, H2SeO3, Na2SeO4, seleno-methionine, seleno-cysteine, SeO2) to mortality, body weight or reproduction of 6 bird species: chicken (Gallus domesticus), duck (Anas platyrhynchos), Japansese quail (Coturnix coturnix japonica), American kestrel (Falco sparverius), black-crowned night-heron (Nycticorax nycticorax) and owl (Otus asio). These studies cover several endpoints such as egg weight, hatchability, egg production and survival of ducklings for exposure periods between 1 and 105 weeks and the NOEC values vary between 1 and 40 mg Se/kg diet (US EPA, Ecological Soil Screening Levels for Selenium, 2007). No consistent and significant difference in toxicity was observed among the various Se compounds tested and therefore, all data were taken into account. Studies reporting the lowest NOEC values were screened for their reliability and the lowest reliable NOEC value among all data is a 21-day NOEC of 1 mg Se/kg diet for effect of Se on growth of Gallus domesticus which were fed a selenium contaminated diet (Jensen, 1986). This study is selected for the effects assessment of dietary toxicity of Se.

U. S. Environmental Protection Agency. (2007) Ecological Soil Screening Levels for Selenium, U.S. Environmental Protection Agency, Washington, DC, USA. pp. 180.