| Abstract: | Forty pairs of mallards (Anas platyrhynchos) were fed 15 ppm selenium as selenomethionine for about 21 weeks during winter. Twenty pairs served as controls. At the end of 21 weeks, which coincided with the onset of the reproductive season, selenium treatment was ended. Four birds died while on selenium treatment. Treated females lost weight, and their egg-laying was delayed. Hatching success of some of the first eggs laid by selenium-treated females was lower than that of controls, and a few of these early eggs contained deformed embryos, but, after a period of about two weeks off the selenium-treated diet, reproductive success returned to a level comparable with that of controls. The return to normal reproductive success was the result of a corresponding decrease in selenium concentrations in eggs once selenium treatment ended. |
| Genre: | Article |
| ProdID: | 5222776 |
| Citation Author: | Heinz, G.H.; Fitzgerald, M. A. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation End Page: | 122 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Environmental Pollution |
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| Citation Number Of Pages: | 6 |
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| Citation Phsyical Description: | 117-122 |
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| Citation Search Results Text: | Reproduction of mallards following overwinter exposure to selenium; 1993; Article; Journal; Environmental Pollution; Heinz, G.H.; Fitzgerald, M. A. |
| Citation Start Page: | 117 |
| Citation Volume: | 81 |
| Citation Year: | 1993 |
| Type: | citation/reference |
| Text: | Reproduction of mallards following overwinter exposure to selenium; 1993; Article; Journal; Environmental Pollution; Heinz, G.H.; Fitzgerald, M. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DOCUMENT): | http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VB5-4914SKH-M4&_user=696292&_coverDate=12%2F31%2F1993&_rdoc=4&_fmt=summary&_orig=browse&_srch=doc-info(%23toc%235917%231993%23999189997%23439691%23FLP%23display%23Volume)&_cdi=5917&_sort=d&_docanchor=&_ct=19&_acct=C000038819&_version=1&_urlVersion=0&_userid=696292&md5=465facc7f08fe20a7b2e84896a53552a |
| Date Other: | Wed, 16 Jun 2010 12:18 -0500 |
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