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Re‐exposure of mallards to selenium after chronic exposure
Author(s) -
Heinz Gary H.
Publication year - 1993
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620120918
Subject(s) - selenium , anas , zoology , biology , body weight , wet weight , toxicity , toxicology , chemistry , endocrinology , ecology , organic chemistry
Adult male mallards ( Anas platyrhynchos ) were fed a control diet or a diet containing 15 ppm selenium as seleno‐D,L‐methionine for 21 weeks. After this initial exposure, the mallards were fed untreated food for 12 weeks, then were re‐exposed to selenium at 100 ppm for five weeks. During re‐exposure to 100 ppm selenium, the birds that had previously been exposed to 15 ppm selenium and those that had not previously been exposed did not differ in percentage of mortality (14.7 and 14.3%), weight loss in survivors (39.3 and 41.2%), selenium concentrations in the livers of survivors (35 and 53 ppm, wet weight), or selenium concentrations in the livers of birds that died (35 and 40 ppm, respectively). When the data from the birds that had previously been exposed to 15 ppm selenium were combined with the data from the birds that had not previously been exposed, selenium concentrations in the livers of birds that had died on the 100‐ppm selenium treatment (38 ppm) did not differ from the concentrations in the livers of birds that had survived (43 ppm).