Gonadal function arrest in fillies after birth, as reflected by steroid serum concentrations

Detalhes bibliográficos
Autor(a) principal: Nogueira, Guilherme de Paula
Data de Publicação: 2000
Outros Autores: Barnabe, Renato Campanarut, Moreira, Alankardson Ferreira, Verreschi, Ieda Therezinha do Nascimento [UNIFESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNIFESP
Texto Completo: http://dx.doi.org/10.1590/S1413-95962000000400008
http://repositorio.unifesp.br/handle/11600/893
Resumo: Sexual maturation involves restraint of gonadal activity from birth to puberty, while somatic development continues. Fetal gonadal steroidogenesis is very important for the maintenance of pregnancy and foaling in mares. The present study was conducted to evaluate gonadal steroid serum levels in foals after birth. Five fillies born at Equília Stud Farm, Avaré, SP, Brazil, were studied. Blood samples were collected daily in the morning during the first week of life. Progesterone serum levels were measured by a commercial radioimmunoassay (RIA) kit and estradiol serum levels with a sensitized non-commercial RIA. At birth, both progesterone and estradiol serum levels were high (13.46 ± 5.5 nmol/l and 7.95 ± 1.5 nmol/l) and decreased to undetectable levels at the end of the first week of life. A negative correlation was found between fillie age and gonadal serum steroid concentration. Results show that fetal gonadal activity persists until birth, and decreases gradual and slowly during the first week of life, as reflected by steroid concentrations in the blood.
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spelling Gonadal function arrest in fillies after birth, as reflected by steroid serum concentrationsSupressão da função gonadal em potras após o nascimento, refletido pela concentração sérica de esteróides gonadaisFilliesSteroidsBirthPotrasEsteróidesNascimentoSexual maturation involves restraint of gonadal activity from birth to puberty, while somatic development continues. Fetal gonadal steroidogenesis is very important for the maintenance of pregnancy and foaling in mares. The present study was conducted to evaluate gonadal steroid serum levels in foals after birth. Five fillies born at Equília Stud Farm, Avaré, SP, Brazil, were studied. Blood samples were collected daily in the morning during the first week of life. Progesterone serum levels were measured by a commercial radioimmunoassay (RIA) kit and estradiol serum levels with a sensitized non-commercial RIA. At birth, both progesterone and estradiol serum levels were high (13.46 ± 5.5 nmol/l and 7.95 ± 1.5 nmol/l) and decreased to undetectable levels at the end of the first week of life. A negative correlation was found between fillie age and gonadal serum steroid concentration. Results show that fetal gonadal activity persists until birth, and decreases gradual and slowly during the first week of life, as reflected by steroid concentrations in the blood.A maturação sexual envolve a supressão da atividade gonadal entre o nascimento e a puberdade, enquanto o desenvolvimento somático prossegue. A esteroidogênese na gônada fetal é muito importante para a manutenção da prenhez e para o parto das éguas. O presente trabalho foi conduzido para avaliar os níveis séricos de esteróides gonadais em potras após o nascimento. Cinco potras nascidas no Haras Equília, Avaré, São Paulo, foram estudadas. Procedeu-se à colheita de sangue diariamente pela manhã, durante a primeira semana de vida. Os níveis de progesterona foram medidos por meio de um kit comercial de radioimunoensaio (RIA), enquanto os níveis de estradiol o foram por um RIA sensibilizado não-comercial. Ao nascimento, tanto os níveis de progesterona quanto os de estradiol mostraram-se altos (13,46 ± 5,5 nmol/L e 7,95 ± 1,5 nmol/L), diminuindo a níveis não detectáveis no fim da primeira semana de vida. Uma correlação negativa foi detectada entre a idade das potras e a concentração de esteróides das gônadas. Os resultados mostram que a atividade secretora da gonada fetal persiste até o nascimento, diminuindo gradativamente durante a primeira semana de vida, demonstrada pela variação na concentração sérica de esteróides.Universidade Estadual Paulista Faculdade de Odontologia de Araçatuba Departamento de Apoio de Produção e Saúde AnimalUniversidade de São Paulo Faculdade de Medicina Veterinária e Zootecnia Departamento de Reprodução AnimalHaras EquíliaUniversidade Federal de São Paulo (UNIFESP) Escola Paulista de Medicina Departamento de EndocrinologiaUNIFESP, EPM, Depto. de EndocrinologiaSciELOFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação para o Desenvolvimento da UNESP (FUNDUNESP)Faculdade de Medicina Veterinária e Zootecnia / Universidade de São PauloUniversidade Estadual Paulista (UNESP)Universidade de São Paulo (USP)Haras EquíliaUniversidade Federal de São Paulo (UNIFESP)Nogueira, Guilherme de PaulaBarnabe, Renato CampanarutMoreira, Alankardson FerreiraVerreschi, Ieda Therezinha do Nascimento [UNIFESP]2015-06-14T13:24:59Z2015-06-14T13:24:59Z2000-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://dx.doi.org/10.1590/S1413-95962000000400008Brazilian Journal of Veterinary Research and Animal Science. Faculdade de Medicina Veterinária e Zootecnia / Universidade de São Paulo, v. 37, n. 4, p. 00-00, 2000.10.1590/S1413-95962000000400008S1413-95962000000400008.pdf1413-9596S1413-95962000000400008http://repositorio.unifesp.br/handle/11600/893engBrazilian Journal of Veterinary Research and Animal Scienceinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UNIFESPinstname:Universidade Federal de São Paulo (UNIFESP)instacron:UNIFESP2024-07-29T04:14:41Zoai:repositorio.unifesp.br/:11600/893Repositório InstitucionalPUBhttp://www.repositorio.unifesp.br/oai/requestbiblioteca.csp@unifesp.bropendoar:34652024-07-29T04:14:41Repositório Institucional da UNIFESP - Universidade Federal de São Paulo (UNIFESP)false
dc.title.none.fl_str_mv Gonadal function arrest in fillies after birth, as reflected by steroid serum concentrations
Supressão da função gonadal em potras após o nascimento, refletido pela concentração sérica de esteróides gonadais
title Gonadal function arrest in fillies after birth, as reflected by steroid serum concentrations
spellingShingle Gonadal function arrest in fillies after birth, as reflected by steroid serum concentrations
Nogueira, Guilherme de Paula
Fillies
Steroids
Birth
Potras
Esteróides
Nascimento
title_short Gonadal function arrest in fillies after birth, as reflected by steroid serum concentrations
title_full Gonadal function arrest in fillies after birth, as reflected by steroid serum concentrations
title_fullStr Gonadal function arrest in fillies after birth, as reflected by steroid serum concentrations
title_full_unstemmed Gonadal function arrest in fillies after birth, as reflected by steroid serum concentrations
title_sort Gonadal function arrest in fillies after birth, as reflected by steroid serum concentrations
author Nogueira, Guilherme de Paula
author_facet Nogueira, Guilherme de Paula
Barnabe, Renato Campanarut
Moreira, Alankardson Ferreira
Verreschi, Ieda Therezinha do Nascimento [UNIFESP]
author_role author
author2 Barnabe, Renato Campanarut
Moreira, Alankardson Ferreira
Verreschi, Ieda Therezinha do Nascimento [UNIFESP]
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (UNESP)
Universidade de São Paulo (USP)
Haras Equília
Universidade Federal de São Paulo (UNIFESP)
dc.contributor.author.fl_str_mv Nogueira, Guilherme de Paula
Barnabe, Renato Campanarut
Moreira, Alankardson Ferreira
Verreschi, Ieda Therezinha do Nascimento [UNIFESP]
dc.subject.por.fl_str_mv Fillies
Steroids
Birth
Potras
Esteróides
Nascimento
topic Fillies
Steroids
Birth
Potras
Esteróides
Nascimento
description Sexual maturation involves restraint of gonadal activity from birth to puberty, while somatic development continues. Fetal gonadal steroidogenesis is very important for the maintenance of pregnancy and foaling in mares. The present study was conducted to evaluate gonadal steroid serum levels in foals after birth. Five fillies born at Equília Stud Farm, Avaré, SP, Brazil, were studied. Blood samples were collected daily in the morning during the first week of life. Progesterone serum levels were measured by a commercial radioimmunoassay (RIA) kit and estradiol serum levels with a sensitized non-commercial RIA. At birth, both progesterone and estradiol serum levels were high (13.46 ± 5.5 nmol/l and 7.95 ± 1.5 nmol/l) and decreased to undetectable levels at the end of the first week of life. A negative correlation was found between fillie age and gonadal serum steroid concentration. Results show that fetal gonadal activity persists until birth, and decreases gradual and slowly during the first week of life, as reflected by steroid concentrations in the blood.
publishDate 2000
dc.date.none.fl_str_mv 2000-01-01
2015-06-14T13:24:59Z
2015-06-14T13:24:59Z
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1590/S1413-95962000000400008
Brazilian Journal of Veterinary Research and Animal Science. Faculdade de Medicina Veterinária e Zootecnia / Universidade de São Paulo, v. 37, n. 4, p. 00-00, 2000.
10.1590/S1413-95962000000400008
S1413-95962000000400008.pdf
1413-9596
S1413-95962000000400008
http://repositorio.unifesp.br/handle/11600/893
url http://dx.doi.org/10.1590/S1413-95962000000400008
http://repositorio.unifesp.br/handle/11600/893
identifier_str_mv Brazilian Journal of Veterinary Research and Animal Science. Faculdade de Medicina Veterinária e Zootecnia / Universidade de São Paulo, v. 37, n. 4, p. 00-00, 2000.
10.1590/S1413-95962000000400008
S1413-95962000000400008.pdf
1413-9596
S1413-95962000000400008
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Brazilian Journal of Veterinary Research and Animal Science
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Faculdade de Medicina Veterinária e Zootecnia / Universidade de São Paulo
publisher.none.fl_str_mv Faculdade de Medicina Veterinária e Zootecnia / Universidade de São Paulo
dc.source.none.fl_str_mv reponame:Repositório Institucional da UNIFESP
instname:Universidade Federal de São Paulo (UNIFESP)
instacron:UNIFESP
instname_str Universidade Federal de São Paulo (UNIFESP)
instacron_str UNIFESP
institution UNIFESP
reponame_str Repositório Institucional da UNIFESP
collection Repositório Institucional da UNIFESP
repository.name.fl_str_mv Repositório Institucional da UNIFESP - Universidade Federal de São Paulo (UNIFESP)
repository.mail.fl_str_mv biblioteca.csp@unifesp.br
_version_ 1814268375506878464

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