The Experts below are selected from a list of 258 Experts worldwide ranked by ideXlab platform
Bart Kempenaers - One of the best experts on this subject based on the ideXlab platform.
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Testosterone and testes size in mallards (Anas platyrhynchos)
Journal of Ornithology, 2006Co-Authors: Angelika G. Denk, Bart KempenaersAbstract:The steroid hormone testosterone (T) mediates the expression of many secondary sexual characters, including behaviors which influence male reproductive success. Testes are one of the major sources of androgens, in particular of T. Although a positive relationship between testes size and T levels could be hypothesized, it has rarely been tested intraspecifically. We investigated this link in mallards ( Anas platyrhynchos ) using a double-antibody radioimmuno-assay to measure hormone levels and X-rays to determine testes size. Here, we report a positive correlation between both traits in a group of 13 drakes during the reproductive season.
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Seven polymorphic microsatellite loci for paternity assessment in the mallard (Anas platyrhynchos)
Molecular Ecology Notes, 2004Co-Authors: Angelika G. Denk, B. Gautschi, Kim Lois Carter, Bart KempenaersAbstract:Seven polymorphic microsatellite loci for paternity assessment in the mallard (Anas platyrhynchos)
Elisa Bozzato - One of the best experts on this subject based on the ideXlab platform.
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Unilateral seminoma with multiple visceral metastases in a duck (Anas platyrhynchos)
Avian Pathology, 2006Co-Authors: Franco Mutinelli, Marta Vascellari, Elisa BozzatoAbstract:A case of unilateral seminoma with visceral metastases in a Mallard duck (Anas platyrhynchos) is reported. Right testis appeared markedly enlarged. The liver surface showed multifocal to coalescent regular circular umbilicated white-greyish spots. In addition, multiple rough whitish nodules were evident on pancreas and visceral peritoneum lining the intestine. Histologically, the right testis parenchyma was diffusely affected and replaced by neoplastic growth, consisting of sheets of large round to polyhedral cells with conspicuous vesicular nuclei having a chromatin network and prominent nucleoli. Similar features were observed also in the other affected organs. Multiple lung metastases were detected on histology. This is the first known report of seminoma with hepatic, pancreatic, pulmonary and peritoneal metastases in a Mallard duck.
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Unilateral seminoma with multiple visceral metastases in a duck (Anas platyrhynchos).
Avian pathology : journal of the W.V.P.A, 2006Co-Authors: Franco Mutinelli, Marta Vascellari, Elisa BozzatoAbstract:A case of unilateral seminoma with visceral metastases in a Mallard duck (Anas platyrhynchos) is reported. The right testis was markedly enlarged. The liver surface showed multifocal to coalescent regular circular umbilicated greyish-white spots. In addition, multiple rough whitish nodules were evident on the pancreas and the visceral peritoneum lining the intestine. Histologically, the right testicular parenchyma was diffusely affected and replaced by neoplastic growth, consisting of sheets of large round to polyhedral cells with conspicuous vesicular nuclei having distinctly granular chromatin and prominent nucleoli. Sheets of cells with similar features were observed also in the other affected organs. Multiple lung metastases were detected on histology. This is the first known report of seminoma with hepatic, pancreatic, pulmonary and peritoneal metastases in a Mallard duck.
Gary A. Wobeser - One of the best experts on this subject based on the ideXlab platform.
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VITAMIN A STATUS OF WILD MALLARDS (Anas platyrhynchos) WINTERING IN SASKATCHEWAN
Journal of wildlife diseases, 1995Co-Authors: Sandra Honour, Sean W. Kennedy, Suzanne Trudeau, Gary A. WobeserAbstract:Vitamin A status of wild male mallards (Anas platyrhynchos) overwintering in Saskatchewan, Canada was determined. Vitamin A levels
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Experimental vitamin A deficiency in mallards (Anas platyrhynchos): lesions and tissue vitamin A levels.
Journal of wildlife diseases, 1995Co-Authors: Sandra Honour, Sean W. Kennedy, Suzanne Trudeau, Gary A. WobeserAbstract:Captive mallards (Anas platyrhynchos), fed an all-grain diet for up to 5 months during the winters of 1991 to 1992 and 1992 to 1993, developed lesions of squamous metaplasia; some had no detectable hepatic vitamin A. Vitamin A deficiency in mallards was defined as hepatic levels of retinyl palmitate 600 μg of hepatic retinyl palmitate per g liver, fed a diet deficient in vitamin A were unlikely to become deficient over a 5 month period. Birds fed an all-grain diet had significantly lower vitamin A concentrations in their liver compared to those fed an all-grain diet with vitamin A added. Liver weight, when corrected for body size, did not affect ...
Bénédicte Lambrecht - One of the best experts on this subject based on the ideXlab platform.
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identification and complete genome sequencing of paramyxoviruses in mallard ducks Anas platyrhynchos using random access amplification and next generation sequencing technologies
Virology Journal, 2011Co-Authors: Toon Rosseel, Bénédicte Lambrecht, Frank P H A Vandenbussche, Thierry Van Den Berg, Steven Van BormAbstract:Background During a wildlife screening program for avian influenza A viruses (AIV) and avian paramyxoviruses (APMV) in Belgium, we isolated two hemagglutinating agents from pools of cloacal swabs of wild mallards (Anas platyrhynchos) caught in a single sampling site at two different times. AIV and APMV1 were excluded using hemagglutination inhibition (HI) testing and specific real-time RT-PCR tests.
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Genetic characterization of low pathogenic H5N1 and co-circulating avian influenza viruses in wild mallards (Anas platyrhynchos) in Belgium, 2008.
Avian pathology : journal of the W.V.P.A, 2011Co-Authors: S. Van Borm, Didier Vangeluwe, M. Steensels, Olivier Poncin, T. Van Den Berg, Bénédicte LambrechtAbstract:As part of a long-term wild bird monitoring programme, five different low pathogenic (LP) avian influenza viruses (AIVs) were isolated from wild mallards (subtypes H1N1, H4N6, H5N1, H5N3, and H10N7). A LP H5N1 and two co-circulating (same location, same time period) viruses were selected for full genome sequencing. An H1N1 (A/Anas platyrhynchos/Belgium/09-762/2008) and an H5N1 virus (A/Anas platyrhynchos/Belgium/09-762-P1/2008) were isolated on the same day in November 2008, then an H5N3 virus (A/Anas platyrhynchos/09-884/2008) 5 days later in December 2008. All genes of these co-circulating viruses shared common ancestors with recent (2001 to 2007) European wild waterfowl influenza viruses. The H5N1 virus shares genome segments with both the H1N1 (PB1, NA, M) and the H5N3 (PB2, HA) viruses, and all three viruses share the same NS sequence. A double infection with two different PA segments from H5N1 and from H5N3 could be observed for the H1N1 sample. The observed gene constellations resulted from multipl...
Angelika G. Denk - One of the best experts on this subject based on the ideXlab platform.
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Testosterone and testes size in mallards (Anas platyrhynchos)
Journal of Ornithology, 2006Co-Authors: Angelika G. Denk, Bart KempenaersAbstract:The steroid hormone testosterone (T) mediates the expression of many secondary sexual characters, including behaviors which influence male reproductive success. Testes are one of the major sources of androgens, in particular of T. Although a positive relationship between testes size and T levels could be hypothesized, it has rarely been tested intraspecifically. We investigated this link in mallards ( Anas platyrhynchos ) using a double-antibody radioimmuno-assay to measure hormone levels and X-rays to determine testes size. Here, we report a positive correlation between both traits in a group of 13 drakes during the reproductive season.
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Seven polymorphic microsatellite loci for paternity assessment in the mallard (Anas platyrhynchos)
Molecular Ecology Notes, 2004Co-Authors: Angelika G. Denk, B. Gautschi, Kim Lois Carter, Bart KempenaersAbstract:Seven polymorphic microsatellite loci for paternity assessment in the mallard (Anas platyrhynchos)