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1. | | PIMENTEL, P. G.; PEREIRA, E. S.; QUEIROZ, A. C. de; MIZUBUTI, I. Y.; REGADAS FILHO, J. G. L.; MAIA, I. S. G. Intake, apparent nutrient digestibility and ingestive behavior of sheep fed cashew nut meal. Revista Brasileira de Zootecnia, Viçosa, MG, v. 40, n. 5, p. 1128-1133, 2011. Biblioteca(s): Embrapa Caprinos e Ovinos. |
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2. | | LIMA, F. R. G.; ARAÚJO, A. A. de; SANTOS, D. O.; LIMA, I. C. S.; SILVA, K. Q.; VASCONECELOS, A. M.; MILANI, G.; MAIA, I. S. G. Utilização da gema de ovo de diferentes espécies e proporções sobre a conservação do sêmen congelado de ovinos da raça. In: CONGRESSO BRASILEIRO DE ZOOTECNIA, 19.; CONGRESSO INTERNACIONAL DE ZOOTECNIA, 11; FÓRUM DE COORDENADORES DE CURSOS DE ZOOTECNIA DAS UNIVERSIDADES BRASILEIRAS, 5.; FÓRUM DE ESTUDANTES DE CURSOS DE ZOOTECNIA DAS UNIVERSIDADES BRASILEIRAS, 5.; REUNIÃO NACIONAL DE ENSINO DE ZOOTECNIA, 15.; FÓRUM DE ENTIDADES DE ZOOTECNISTAS, 22. 2009, Águas de Lindóia. Visão estratégica de cadeias do agronegócio: anais. Pirassununga: Faculdade de Zootecnia e Engenharia de Alimentos: Associação Brasileira de Zootecnistas, 2009. Zootec 2009. 3 p. 1 CD-ROM. Biblioteca(s): Embrapa Caprinos e Ovinos. |
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3. | | PEREIRA, E. S.; PIMENTEL, P. G.; DUARTE, L. S.; MIZUBUTI, I. Y.; ARAUJO, G. G. L. de; CARNEIRO, M. S. de S.; REGADAS FILHO, J. G. L.; MAIA, I. S. G. Determinação das frações proteicas e de carboidratos e estimativa do valor energético de forrageiras e subprodutos da agroindústria produzidos no Nordeste Brasileiro. Semina: Ciências Agrárias, v. 31, n. 4, p. 1079-1094, out./dez. 2010. Biblioteca(s): Embrapa Semiárido. |
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Registros recuperados : 3 | |
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Registro Completo
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
15/12/2014 |
Data da última atualização: |
15/12/2014 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 1 |
Autoria: |
RIVERO-WENDT, C. L. G.; BORGES, A. C.; OLIVEIRA FILHO, E. C. de; MIRANDA-VILELA, A. L.; FERREIRA, M. F. N.; GRISOLIA, C. K. |
Afiliação: |
UNB; UNB; EDUARDO CYRINO DE OLIVEIRA FILHO, CPAC; UNB; UNB; UNB. |
Título: |
Effects of 17α-methyltestosterone on the reproduction of the freshwater snail Biomphalaria glabrata. |
Ano de publicação: |
2014 |
Fonte/Imprenta: |
Genetics and Molecular Research, v. 13, n. 1, p. 605-615, 2014. |
ISSN: |
1676-5680 |
DOI: |
http://dx.doi.org/10.4238/2014.January.28.6 |
Idioma: |
Inglês |
Conteúdo: |
17-α-methyltestosterone (MT) is a synthetic hormone used in fish hatcheries to induce male monosex. Snails hold promise as possible test models to assess chemicals acting on the endocrine system. Biomphalaria glabrata is an aquatic gastropod mollusk (Pulmonata, Planorbidae) that can be easily maintained in aquaria, predisposing the species for use in ecotoxicological testing. This study evaluated the reproductive effects of MT on B. glabrata by examining histological changes and its reproductive performance. Ten snails per group were exposed for 4 weeks to different concentrations of MT (0.01, 0.1, and 1.0 mg/L). The total number of laid eggs, egg mass per group, size of type V oocytes, and production of spermatozoids were determined. Reproduction of B. glabrata was affected by MT. At the lowest concentration (0.01 mg/L), MT caused a statistically significant increase in the number of egg mass per snail compared with controls unexposed to MT. Histopathology analyses showed an increase in the sperm production at the higher MT concentrations of 0.1 and 1.0 mg/L. Chromatographic analyses of water samples showed that MT concentrations rapidly declined within a 96-h period. These results highlight the importance of giving more support to regulatory authorities, since MT is not registered for use on fish hatcheries in many countries around the world. Wastewater from fish farms discharged into aquatic ecosystems should be monitored for MT residues, since its presence could compromise the reproduction of other native snail species. Menos17-α-methyltestosterone (MT) is a synthetic hormone used in fish hatcheries to induce male monosex. Snails hold promise as possible test models to assess chemicals acting on the endocrine system. Biomphalaria glabrata is an aquatic gastropod mollusk (Pulmonata, Planorbidae) that can be easily maintained in aquaria, predisposing the species for use in ecotoxicological testing. This study evaluated the reproductive effects of MT on B. glabrata by examining histological changes and its reproductive performance. Ten snails per group were exposed for 4 weeks to different concentrations of MT (0.01, 0.1, and 1.0 mg/L). The total number of laid eggs, egg mass per group, size of type V oocytes, and production of spermatozoids were determined. Reproduction of B. glabrata was affected by MT. At the lowest concentration (0.01 mg/L), MT caused a statistically significant increase in the number of egg mass per snail compared with controls unexposed to MT. Histopathology analyses showed an increase in the sperm production at the higher MT concentrations of 0.1 and 1.0 mg/L. Chromatographic analyses of water samples showed that MT concentrations rapidly declined within a 96-h period. These results highlight the importance of giving more support to regulatory authorities, since MT is not registered for use on fish hatcheries in many countries around the world. Wastewater from fish farms discharged into aquatic ecosystems should be monitored for MT residues, since its presence could com... Mostrar Tudo |
Palavras-Chave: |
Desreguladores endócrinos; Hormônio sintético; Performance reprodutiva. |
Thesagro: |
Biomphalaria Glabrata; Histopatologia. |
Thesaurus NAL: |
Endocrine-disrupting chemicals; Histopathology; Methyltestosterone; Reproductive performance; Synthetic hormones. |
Categoria do assunto: |
S Ciências Biológicas |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/113741/1/34253.pdf
|
Marc: |
LEADER 02596naa a2200325 a 4500 001 2002535 005 2014-12-15 008 2014 bl uuuu u00u1 u #d 022 $a1676-5680 024 7 $ahttp://dx.doi.org/10.4238/2014.January.28.6$2DOI 100 1 $aRIVERO-WENDT, C. L. G. 245 $aEffects of 17α-methyltestosterone on the reproduction of the freshwater snail Biomphalaria glabrata. 260 $c2014 520 $a17-α-methyltestosterone (MT) is a synthetic hormone used in fish hatcheries to induce male monosex. Snails hold promise as possible test models to assess chemicals acting on the endocrine system. Biomphalaria glabrata is an aquatic gastropod mollusk (Pulmonata, Planorbidae) that can be easily maintained in aquaria, predisposing the species for use in ecotoxicological testing. This study evaluated the reproductive effects of MT on B. glabrata by examining histological changes and its reproductive performance. Ten snails per group were exposed for 4 weeks to different concentrations of MT (0.01, 0.1, and 1.0 mg/L). The total number of laid eggs, egg mass per group, size of type V oocytes, and production of spermatozoids were determined. Reproduction of B. glabrata was affected by MT. At the lowest concentration (0.01 mg/L), MT caused a statistically significant increase in the number of egg mass per snail compared with controls unexposed to MT. Histopathology analyses showed an increase in the sperm production at the higher MT concentrations of 0.1 and 1.0 mg/L. Chromatographic analyses of water samples showed that MT concentrations rapidly declined within a 96-h period. These results highlight the importance of giving more support to regulatory authorities, since MT is not registered for use on fish hatcheries in many countries around the world. Wastewater from fish farms discharged into aquatic ecosystems should be monitored for MT residues, since its presence could compromise the reproduction of other native snail species. 650 $aEndocrine-disrupting chemicals 650 $aHistopathology 650 $aMethyltestosterone 650 $aReproductive performance 650 $aSynthetic hormones 650 $aBiomphalaria Glabrata 650 $aHistopatologia 653 $aDesreguladores endócrinos 653 $aHormônio sintético 653 $aPerformance reprodutiva 700 1 $aBORGES, A. C. 700 1 $aOLIVEIRA FILHO, E. C. de 700 1 $aMIRANDA-VILELA, A. L. 700 1 $aFERREIRA, M. F. N. 700 1 $aGRISOLIA, C. K. 773 $tGenetics and Molecular Research$gv. 13, n. 1, p. 605-615, 2014.
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