Effect of Genistein-Enriched Diets on the Endocrine Process of Gametogenesis and on Reproduction Efficiency of the Rainbow Trout Oncorhynchus mykiss
Identifieur interne : 001407 ( Istex/Corpus ); précédent : 001406; suivant : 001408Effect of Genistein-Enriched Diets on the Endocrine Process of Gametogenesis and on Reproduction Efficiency of the Rainbow Trout Oncorhynchus mykiss
Auteurs : Catherine Bennetau-Pelissero ; Bernard Breton B ; Bernard Bennetau ; Geneviève Corraze ; Françoise Le Menn ; Blandine Davail-Cuisset ; Chantal Helou ; Sadasivam J. KaushikSource :
- General and Comparative Endocrinology [ 0016-6480 ] ; 2001.
English descriptors
- KwdEn :
- GTH, diet, genistein, reproduction, steroid, trout, vitellogenin.
Abstract
Three practical diets were formulated to contain 0, 500, or 1000 ppm genistein. The three diets were distributed for 1 year to groups of rainbow trout undergoing their first gametogenesis and until spawning. Growth performance of rainbow trout was not affected by dietary treatments. Plasma cholesterol levels were equivalent between groups. In males, a slight but constant induction of vitellogenin (VTG) synthesis and a decrease in testosterone levels were observed. A slight decrease in plasma levels of βFSH and βLH was noticed at the end of spermatogenesis in the male fish fed a diet with 500 ppm (genistein) (from 2.16 ± 0.39 to 1.47 ± 0.23 for βFSH and from 0.44 ± 0.09 to 0.31 ± 0.09 for βLH). There was a significantly reduced 17α,20β(OH)2-progesterone (from 10.93 ± 0.88 in control to 5.46 ± 0.92 in males and from 251.22 ± 21.40 to 183.22 ± 13.48 in females). Testicular development was accelerated in genistein-fed fish, and sperm motility and concentration were decreased in a dose-dependent manner at spawning. In females, a significant increase in plasma VTG occurred only at the beginning and at the end of oogenesis. Testosterone levels were decreased at the beginning of oogenesis. Both βFSH and βLH were decreased by genistein (from 6.38 ± 1.55 to 3.44 ± 0.82 for βFSH and from 15.18 ± 3.00 to 6.93 ± 0.99 for βLH in females), whereas spawning was delayed only in females fed the diet with 500 ppm of genistein. Gamete quality was impaired only in this group, as underlined by a lower percentage of ovulating females (from 100 to 79% at the end of the trial), a lower fertilization rate, and a lower viability of fry. These results may be explained by the agonistic/antagonistic effect of genistein on estrogen function related to the tissue ratio between endogenous estrogens/genistein.
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DOI: 10.1006/gcen.2000.7585
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ISTEX:2038EBE2ABEC162278BED14E47FC01CCCFE2AB54Le document en format XML
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The three diets were distributed for 1 year to groups of rainbow trout undergoing their first gametogenesis and until spawning. Growth performance of rainbow trout was not affected by dietary treatments. Plasma cholesterol levels were equivalent between groups. In males, a slight but constant induction of vitellogenin (VTG) synthesis and a decrease in testosterone levels were observed. A slight decrease in plasma levels of βFSH and βLH was noticed at the end of spermatogenesis in the male fish fed a diet with 500 ppm (genistein) (from 2.16 ± 0.39 to 1.47 ± 0.23 for βFSH and from 0.44 ± 0.09 to 0.31 ± 0.09 for βLH). There was a significantly reduced 17α,20β(OH)2-progesterone (from 10.93 ± 0.88 in control to 5.46 ± 0.92 in males and from 251.22 ± 21.40 to 183.22 ± 13.48 in females). Testicular development was accelerated in genistein-fed fish, and sperm motility and concentration were decreased in a dose-dependent manner at spawning. In females, a significant increase in plasma VTG occurred only at the beginning and at the end of oogenesis. Testosterone levels were decreased at the beginning of oogenesis. Both βFSH and βLH were decreased by genistein (from 6.38 ± 1.55 to 3.44 ± 0.82 for βFSH and from 15.18 ± 3.00 to 6.93 ± 0.99 for βLH in females), whereas spawning was delayed only in females fed the diet with 500 ppm of genistein. Gamete quality was impaired only in this group, as underlined by a lower percentage of ovulating females (from 100 to 79% at the end of the trial), a lower fertilization rate, and a lower viability of fry. These results may be explained by the agonistic/antagonistic effect of genistein on estrogen function related to the tissue ratio between endogenous estrogens/genistein.</div></front></TEI><istex><corpusName>elsevier</corpusName><author><json:item><name>Catherine Bennetau-Pelissero</name><affiliations><json:string>ENITA de Bordeaux, 1 Cours du Général de Gaulle, B.P. 201, 33175, Gradignan, France</json:string></affiliations></json:item><json:item><name>Bernard Breton B</name><affiliations><json:string>Laboratoire de Physiologie des Poissons, INRA, Université de Rennes I, 35042, Rennes, France</json:string></affiliations></json:item><json:item><name>Bernard Bennetau</name><affiliations><json:string>Laboratoire de Chime Organique et Organométallique, UMR 5802 CNRS, Université Bordeaux I, 351 Cours de la Libération, 33405, Talence, France</json:string></affiliations></json:item><json:item><name>Geneviève Corraze</name><affiliations><json:string>Laboratoire de Nutrition des Poissons, Unité Mixte INRA-IFREMER, 64310, Saint Pée sur Nivelle, France</json:string></affiliations></json:item><json:item><name>Françoise Le Menn</name><affiliations><json:string>Laboratoire de Biologie de la Reproduction des Poissons, Université Bordeaux I, Avenue des Facultés, 33405, Talence, France</json:string></affiliations></json:item><json:item><name>Blandine Davail-Cuisset</name><affiliations><json:string>Laboratoire de Biologie de la Reproduction des Poissons, Université Bordeaux I, Avenue des Facultés, 33405, Talence, France</json:string></affiliations></json:item><json:item><name>Chantal Helou</name><affiliations><json:string>Laboratoire de Biologie de la Reproduction des Poissons, Université Bordeaux I, Avenue des Facultés, 33405, Talence, France</json:string></affiliations></json:item><json:item><name>Sadasivam J. 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The three diets were distributed for 1 year to groups of rainbow trout undergoing their first gametogenesis and until spawning. Growth performance of rainbow trout was not affected by dietary treatments. Plasma cholesterol levels were equivalent between groups. In males, a slight but constant induction of vitellogenin (VTG) synthesis and a decrease in testosterone levels were observed. A slight decrease in plasma levels of βFSH and βLH was noticed at the end of spermatogenesis in the male fish fed a diet with 500 ppm (genistein) (from 2.16 ± 0.39 to 1.47 ± 0.23 for βFSH and from 0.44 ± 0.09 to 0.31 ± 0.09 for βLH). There was a significantly reduced 17α,20β(OH)2-progesterone (from 10.93 ± 0.88 in control to 5.46 ± 0.92 in males and from 251.22 ± 21.40 to 183.22 ± 13.48 in females). Testicular development was accelerated in genistein-fed fish, and sperm motility and concentration were decreased in a dose-dependent manner at spawning. In females, a significant increase in plasma VTG occurred only at the beginning and at the end of oogenesis. Testosterone levels were decreased at the beginning of oogenesis. Both βFSH and βLH were decreased by genistein (from 6.38 ± 1.55 to 3.44 ± 0.82 for βFSH and from 15.18 ± 3.00 to 6.93 ± 0.99 for βLH in females), whereas spawning was delayed only in females fed the diet with 500 ppm of genistein. Gamete quality was impaired only in this group, as underlined by a lower percentage of ovulating females (from 100 to 79% at the end of the trial), a lower fertilization rate, and a lower viability of fry. These results may be explained by the agonistic/antagonistic effect of genistein on estrogen function related to the tissue ratio between endogenous estrogens/genistein.</abstract><qualityIndicators><score>8</score><pdfVersion>1.3</pdfVersion><pdfPageSize>536 x 720 pts</pdfPageSize><refBibsNative>true</refBibsNative><keywordCount>7</keywordCount><abstractCharCount>1807</abstractCharCount><pdfWordCount>8143</pdfWordCount><pdfCharCount>48164</pdfCharCount><pdfPageCount>15</pdfPageCount><abstractWordCount>301</abstractWordCount></qualityIndicators><title>Effect of Genistein-Enriched Diets on the Endocrine Process of Gametogenesis and on Reproduction Efficiency of the Rainbow Trout Oncorhynchus 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Oncorhynchus mykiss</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>ELSEVIER</publisher><availability><p>©2001 Academic Press</p></availability><date>2001</date></publicationStmt><notesStmt><note type="content">Section title: Regular Article</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Effect of Genistein-Enriched Diets on the Endocrine Process of Gametogenesis and on Reproduction Efficiency of the Rainbow Trout Oncorhynchus mykiss</title><author xml:id="author-1"><persName><forename type="first">Catherine</forename><surname>Bennetau-Pelissero</surname></persName><affiliation>ENITA de Bordeaux, 1 Cours du Général de Gaulle, B.P. 201, 33175, Gradignan, France</affiliation></author><author xml:id="author-2"><persName><forename type="first">Bernard</forename><surname>Breton B</surname></persName><affiliation>Laboratoire de Physiologie des Poissons, INRA, Université de Rennes I, 35042, Rennes, France</affiliation></author><author xml:id="author-3"><persName><forename type="first">Bernard</forename><surname>Bennetau</surname></persName><affiliation>Laboratoire de Chime Organique et Organométallique, UMR 5802 CNRS, Université Bordeaux I, 351 Cours de la Libération, 33405, Talence, France</affiliation></author><author xml:id="author-4"><persName><forename type="first">Geneviève</forename><surname>Corraze</surname></persName><affiliation>Laboratoire de Nutrition des Poissons, Unité Mixte INRA-IFREMER, 64310, Saint Pée sur Nivelle, France</affiliation></author><author xml:id="author-5"><persName><forename type="first">Françoise</forename><surname>Le Menn</surname></persName><affiliation>Laboratoire de Biologie de la Reproduction des Poissons, Université Bordeaux I, Avenue des Facultés, 33405, Talence, France</affiliation></author><author xml:id="author-6"><persName><forename type="first">Blandine</forename><surname>Davail-Cuisset</surname></persName><affiliation>Laboratoire de Biologie de la Reproduction des Poissons, Université Bordeaux I, Avenue des Facultés, 33405, Talence, France</affiliation></author><author xml:id="author-7"><persName><forename type="first">Chantal</forename><surname>Helou</surname></persName><affiliation>Laboratoire de Biologie de la Reproduction des Poissons, Université Bordeaux I, Avenue des Facultés, 33405, Talence, France</affiliation></author><author xml:id="author-8"><persName><forename type="first">Sadasivam J.</forename><surname>Kaushik</surname></persName><affiliation>Laboratoire de Nutrition des Poissons, Unité Mixte INRA-IFREMER, 64310, Saint Pée sur Nivelle, France</affiliation></author></analytic><monogr><title level="j">General and Comparative Endocrinology</title><title level="j" type="abbrev">YGCEN</title><idno type="pISSN">0016-6480</idno><idno type="PII">S0016-6480(00)X0012-3</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="2001"></date><biblScope unit="volume">121</biblScope><biblScope 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The three diets were distributed for 1 year to groups of rainbow trout undergoing their first gametogenesis and until spawning. Growth performance of rainbow trout was not affected by dietary treatments. Plasma cholesterol levels were equivalent between groups. In males, a slight but constant induction of vitellogenin (VTG) synthesis and a decrease in testosterone levels were observed. A slight decrease in plasma levels of βFSH and βLH was noticed at the end of spermatogenesis in the male fish fed a diet with 500 ppm (genistein) (from 2.16 ± 0.39 to 1.47 ± 0.23 for βFSH and from 0.44 ± 0.09 to 0.31 ± 0.09 for βLH). There was a significantly reduced 17α,20β(OH)2-progesterone (from 10.93 ± 0.88 in control to 5.46 ± 0.92 in males and from 251.22 ± 21.40 to 183.22 ± 13.48 in females). Testicular development was accelerated in genistein-fed fish, and sperm motility and concentration were decreased in a dose-dependent manner at spawning. In females, a significant increase in plasma VTG occurred only at the beginning and at the end of oogenesis. Testosterone levels were decreased at the beginning of oogenesis. Both βFSH and βLH were decreased by genistein (from 6.38 ± 1.55 to 3.44 ± 0.82 for βFSH and from 15.18 ± 3.00 to 6.93 ± 0.99 for βLH in females), whereas spawning was delayed only in females fed the diet with 500 ppm of genistein. Gamete quality was impaired only in this group, as underlined by a lower percentage of ovulating females (from 100 to 79% at the end of the trial), a lower fertilization rate, and a lower viability of fry. These results may be explained by the agonistic/antagonistic effect of genistein on estrogen function related to the tissue ratio between endogenous estrogens/genistein.</p></abstract><textClass xml:lang="en"><keywords scheme="keyword"><list><head>Keywords</head><item><term>genistein</term></item><item><term>trout</term></item><item><term>steroid</term></item><item><term>vitellogenin</term></item><item><term>GTH</term></item><item><term>reproduction</term></item><item><term>diet</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2001">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/2038EBE2ABEC162278BED14E47FC01CCCFE2AB54/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Elsevier, elements deleted: tail"><istex:xmlDeclaration>version="1.0" encoding="utf-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//ES//DTD journal article DTD version 4.5.2//EN//XML" URI="art452.dtd" name="istex:docType"></istex:docType><istex:document><converted-article version="4.5.2" docsubtype="fla" xml:lang="en"><item-info><jid>YGCEN</jid><aid>97585</aid><ce:pii>S0016-6480(00)97585-3</ce:pii><ce:doi>10.1006/gcen.2000.7585</ce:doi><ce:copyright type="full-transfer" year="2001">Academic Press</ce:copyright></item-info><head><ce:dochead><ce:textfn>Regular Article</ce:textfn></ce:dochead><ce:title>Effect of Genistein-Enriched Diets on the Endocrine Process of Gametogenesis and on Reproduction Efficiency of the Rainbow Trout <ce:italic>Oncorhynchus mykiss</ce:italic></ce:title><ce:author-group><ce:author><ce:given-name>Catherine</ce:given-name><ce:surname>Bennetau-Pelissero</ce:surname><ce:cross-ref refid="A1"><ce:sup>a</ce:sup></ce:cross-ref><ce:cross-ref refid="A2"><ce:sup>b</ce:sup></ce:cross-ref><ce:cross-ref refid="FN1"><ce:sup>1</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>Bernard</ce:given-name><ce:surname>Breton B</ce:surname><ce:cross-ref refid="A3"><ce:sup>c</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>Bernard</ce:given-name><ce:surname>Bennetau</ce:surname><ce:cross-ref refid="A4"><ce:sup>d</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>Geneviève</ce:given-name><ce:surname>Corraze</ce:surname><ce:cross-ref refid="A5"><ce:sup>e</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>Françoise</ce:given-name><ce:surname>Le Menn</ce:surname><ce:cross-ref refid="A2"><ce:sup>b</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>Blandine</ce:given-name><ce:surname>Davail-Cuisset</ce:surname><ce:cross-ref refid="A2"><ce:sup>b</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>Chantal</ce:given-name><ce:surname>Helou</ce:surname><ce:cross-ref refid="A2"><ce:sup>b</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>Sadasivam J.</ce:given-name><ce:surname>Kaushik</ce:surname><ce:cross-ref refid="A5"><ce:sup>e</ce:sup></ce:cross-ref></ce:author><ce:affiliation id="A1"><ce:label>a</ce:label><ce:textfn>ENITA de Bordeaux, 1 Cours du Général de Gaulle, B.P. 201, 33175, Gradignan, France</ce:textfn></ce:affiliation><ce:affiliation id="A2"><ce:label>b</ce:label><ce:textfn>Laboratoire de Biologie de la Reproduction des Poissons, Université Bordeaux I, Avenue des Facultés, 33405, Talence, France</ce:textfn></ce:affiliation><ce:affiliation id="A3"><ce:label>c</ce:label><ce:textfn>Laboratoire de Physiologie des Poissons, INRA, Université de Rennes I, 35042, Rennes, France</ce:textfn></ce:affiliation><ce:affiliation id="A4"><ce:label>d</ce:label><ce:textfn>Laboratoire de Chime Organique et Organométallique, UMR 5802 CNRS, Université Bordeaux I, 351 Cours de la Libération, 33405, Talence, France</ce:textfn></ce:affiliation><ce:affiliation id="A5"><ce:label>e</ce:label><ce:textfn>Laboratoire de Nutrition des Poissons, Unité Mixte INRA-IFREMER, 64310, Saint Pée sur Nivelle, France</ce:textfn></ce:affiliation><ce:footnote id="FN1"><ce:label>1</ce:label><ce:note-para>To whom correspondence and reprint requests should be addressed at the Research Department, Unit Micronutriments, Reproduction, Health 1, Cours du Général de Gaulle, B.P. 201, F33175, Gradignan, France. Fax: 00 33 5 57 35 07 59. E-mail: c-bennetau@enitab.fr.</ce:note-para></ce:footnote></ce:author-group><ce:date-accepted day="31" month="10" year="2000"></ce:date-accepted><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>Three practical diets were formulated to contain 0, 500, or 1000 ppm genistein. The three diets were distributed for 1 year to groups of rainbow trout undergoing their first gametogenesis and until spawning. Growth performance of rainbow trout was not affected by dietary treatments. Plasma cholesterol levels were equivalent between groups. In males, a slight but constant induction of vitellogenin (VTG) synthesis and a decrease in testosterone levels were observed. A slight decrease in plasma levels of βFSH and βLH was noticed at the end of spermatogenesis in the male fish fed a diet with 500 ppm (genistein) (from 2.16 ± 0.39 to 1.47 ± 0.23 for βFSH and from 0.44 ± 0.09 to 0.31 ± 0.09 for βLH). There was a significantly reduced 17α,20β(OH)<ce:inf>2</ce:inf>-progesterone (from 10.93 ± 0.88 in control to 5.46 ± 0.92 in males and from 251.22 ± 21.40 to 183.22 ± 13.48 in females). Testicular development was accelerated in genistein-fed fish, and sperm motility and concentration were decreased in a dose-dependent manner at spawning. In females, a significant increase in plasma VTG occurred only at the beginning and at the end of oogenesis. Testosterone levels were decreased at the beginning of oogenesis. Both βFSH and βLH were decreased by genistein (from 6.38 ± 1.55 to 3.44 ± 0.82 for βFSH and from 15.18 ± 3.00 to 6.93 ± 0.99 for βLH in females), whereas spawning was delayed only in females fed the diet with 500 ppm of genistein. Gamete quality was impaired only in this group, as underlined by a lower percentage of ovulating females (from 100 to 79% at the end of the trial), a lower fertilization rate, and a lower viability of fry. These results may be explained by the agonistic/antagonistic effect of genistein on estrogen function related to the tissue ratio between endogenous estrogens/genistein.</ce:simple-para></ce:abstract-sec></ce:abstract><ce:keywords><ce:section-title>Keywords</ce:section-title><ce:keyword><ce:text>genistein</ce:text></ce:keyword><ce:keyword><ce:text>trout</ce:text></ce:keyword><ce:keyword><ce:text>steroid</ce:text></ce:keyword><ce:keyword><ce:text>vitellogenin</ce:text></ce:keyword><ce:keyword><ce:text>GTH</ce:text></ce:keyword><ce:keyword><ce:text>reproduction</ce:text></ce:keyword><ce:keyword><ce:text>diet</ce:text></ce:keyword></ce:keywords></head></converted-article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Effect of Genistein-Enriched Diets on the Endocrine Process of Gametogenesis and on Reproduction Efficiency of the Rainbow Trout Oncorhynchus mykiss</title></titleInfo><titleInfo type="alternative" lang="en" contentType="CDATA"><title>Effect of Genistein-Enriched Diets on the Endocrine Process of Gametogenesis and on Reproduction Efficiency of the Rainbow Trout</title></titleInfo><name type="personal"><namePart type="given">Catherine</namePart><namePart type="family">Bennetau-Pelissero</namePart><affiliation>ENITA de Bordeaux, 1 Cours du Général de Gaulle, B.P. 201, 33175, Gradignan, France</affiliation><description>To whom correspondence and reprint requests should be addressed at the Research Department, Unit Micronutriments, Reproduction, Health 1, Cours du Général de Gaulle, B.P. 201, F33175, Gradignan, France. Fax: 00 33 5 57 35 07 59. E-mail: c-bennetau@enitab.fr.</description><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Bernard</namePart><namePart type="family">Breton B</namePart><affiliation>Laboratoire de Physiologie des Poissons, INRA, Université de Rennes I, 35042, Rennes, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Bernard</namePart><namePart type="family">Bennetau</namePart><affiliation>Laboratoire de Chime Organique et Organométallique, UMR 5802 CNRS, Université Bordeaux I, 351 Cours de la Libération, 33405, Talence, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Geneviève</namePart><namePart type="family">Corraze</namePart><affiliation>Laboratoire de Nutrition des Poissons, Unité Mixte INRA-IFREMER, 64310, Saint Pée sur Nivelle, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Françoise</namePart><namePart type="family">Le Menn</namePart><affiliation>Laboratoire de Biologie de la Reproduction des Poissons, Université Bordeaux I, Avenue des Facultés, 33405, Talence, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Blandine</namePart><namePart type="family">Davail-Cuisset</namePart><affiliation>Laboratoire de Biologie de la Reproduction des Poissons, Université Bordeaux I, Avenue des Facultés, 33405, Talence, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Chantal</namePart><namePart type="family">Helou</namePart><affiliation>Laboratoire de Biologie de la Reproduction des Poissons, Université Bordeaux I, Avenue des Facultés, 33405, Talence, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Sadasivam J.</namePart><namePart type="family">Kaushik</namePart><affiliation>Laboratoire de Nutrition des Poissons, Unité Mixte INRA-IFREMER, 64310, Saint Pée sur Nivelle, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="Full-length article"></genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">2001</dateIssued><copyrightDate encoding="w3cdtf">2001</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">Three practical diets were formulated to contain 0, 500, or 1000 ppm genistein. The three diets were distributed for 1 year to groups of rainbow trout undergoing their first gametogenesis and until spawning. Growth performance of rainbow trout was not affected by dietary treatments. Plasma cholesterol levels were equivalent between groups. In males, a slight but constant induction of vitellogenin (VTG) synthesis and a decrease in testosterone levels were observed. A slight decrease in plasma levels of βFSH and βLH was noticed at the end of spermatogenesis in the male fish fed a diet with 500 ppm (genistein) (from 2.16 ± 0.39 to 1.47 ± 0.23 for βFSH and from 0.44 ± 0.09 to 0.31 ± 0.09 for βLH). There was a significantly reduced 17α,20β(OH)2-progesterone (from 10.93 ± 0.88 in control to 5.46 ± 0.92 in males and from 251.22 ± 21.40 to 183.22 ± 13.48 in females). Testicular development was accelerated in genistein-fed fish, and sperm motility and concentration were decreased in a dose-dependent manner at spawning. In females, a significant increase in plasma VTG occurred only at the beginning and at the end of oogenesis. Testosterone levels were decreased at the beginning of oogenesis. Both βFSH and βLH were decreased by genistein (from 6.38 ± 1.55 to 3.44 ± 0.82 for βFSH and from 15.18 ± 3.00 to 6.93 ± 0.99 for βLH in females), whereas spawning was delayed only in females fed the diet with 500 ppm of genistein. Gamete quality was impaired only in this group, as underlined by a lower percentage of ovulating females (from 100 to 79% at the end of the trial), a lower fertilization rate, and a lower viability of fry. These results may be explained by the agonistic/antagonistic effect of genistein on estrogen function related to the tissue ratio between endogenous estrogens/genistein.</abstract><note type="content">Section title: Regular Article</note><subject lang="en"><genre>Keywords</genre><topic>genistein</topic><topic>trout</topic><topic>steroid</topic><topic>vitellogenin</topic><topic>GTH</topic><topic>reproduction</topic><topic>diet</topic></subject><relatedItem type="host"><titleInfo><title>General and Comparative Endocrinology</title></titleInfo><titleInfo type="abbreviated"><title>YGCEN</title></titleInfo><genre type="journal">journal</genre><originInfo><dateIssued encoding="w3cdtf">200102</dateIssued></originInfo><identifier type="ISSN">0016-6480</identifier><identifier type="PII">S0016-6480(00)X0012-3</identifier><part><date>200102</date><detail type="volume"><number>121</number><caption>vol.</caption></detail><detail type="issue"><number>2</number><caption>no.</caption></detail><extent unit="issue pages"><start>125</start><end>222</end></extent><extent unit="pages"><start>173</start><end>187</end></extent></part></relatedItem><identifier type="istex">2038EBE2ABEC162278BED14E47FC01CCCFE2AB54</identifier><identifier type="DOI">10.1006/gcen.2000.7585</identifier><identifier type="PII">S0016-6480(00)97585-3</identifier><accessCondition type="use and reproduction" contentType="copyright">©2001 Academic Press</accessCondition><recordInfo><recordContentSource>ELSEVIER</recordContentSource><recordOrigin>Academic Press, ©2001</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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