Follicle profile and plasma gonadotropin concentration in pubertal female ponies
Autor(a) principal: | |
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Data de Publicação: | 2004 |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/S0100-879X2004000600018 http://hdl.handle.net/11449/28076 |
Resumo: | Twelve female ponies were examined daily for 30 days and classified as ovulating (OV; N = 6; 197 ± 6 kg) or prepubertal (PP; N = 6; 196 ± 9 kg). Follicles were detected by ultrasound and gonadotropins quantified by radioimmunoassay. The mean diameter of the largest follicles was significantly larger in OV (38 ± 1 mm) than in PP (26 ± 2 mm) but there was no difference between groups in the size of the second largest follicle. There were more small follicles (<24 mm) in the PP than in the OV group, but PP fillies had a smaller number of follicles >29 mm than the OV fillies. Follicle-stimulating hormone (FSH) levels did not differ between groups but PP fillies had lower luteinizing hormone (LH) peak (8 ± 1 ng/ml) and basal (4 ± 0.5 ng/ml) levels, lower peak magnitude (2 ± 0.2 ng/ml) and period average (5 ± 0.6 ng/ml) than OV fillies (32 ± 4.5, 8 ± 1.2, 17.1 ± 6, and 15 ± 2.3 ng/ml, respectively). The PP group, in contrast to the OV group, showed no relationship between FSH surge and follicle wave emergence. We conclude that an LH concentration higher than 8 ng/ml is needed for follicle growth to a preovulatory size. Wave emergence and FSH secretion seem to be independent events, probably due to an inhibitory neural system in these PP animals. PP fillies may provide a physiological model for the study of follicle wave emergence which apparently does not depend on gonadotropin levels. |
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Repositório Institucional da UNESP |
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Follicle profile and plasma gonadotropin concentration in pubertal female poniesFolliclesFSHLH and prepubertal filliesTwelve female ponies were examined daily for 30 days and classified as ovulating (OV; N = 6; 197 ± 6 kg) or prepubertal (PP; N = 6; 196 ± 9 kg). Follicles were detected by ultrasound and gonadotropins quantified by radioimmunoassay. The mean diameter of the largest follicles was significantly larger in OV (38 ± 1 mm) than in PP (26 ± 2 mm) but there was no difference between groups in the size of the second largest follicle. There were more small follicles (<24 mm) in the PP than in the OV group, but PP fillies had a smaller number of follicles >29 mm than the OV fillies. Follicle-stimulating hormone (FSH) levels did not differ between groups but PP fillies had lower luteinizing hormone (LH) peak (8 ± 1 ng/ml) and basal (4 ± 0.5 ng/ml) levels, lower peak magnitude (2 ± 0.2 ng/ml) and period average (5 ± 0.6 ng/ml) than OV fillies (32 ± 4.5, 8 ± 1.2, 17.1 ± 6, and 15 ± 2.3 ng/ml, respectively). The PP group, in contrast to the OV group, showed no relationship between FSH surge and follicle wave emergence. We conclude that an LH concentration higher than 8 ng/ml is needed for follicle growth to a preovulatory size. Wave emergence and FSH secretion seem to be independent events, probably due to an inhibitory neural system in these PP animals. PP fillies may provide a physiological model for the study of follicle wave emergence which apparently does not depend on gonadotropin levels.Universidade Estadual Paulista Faculdade de Medicina Veterinária Produção e Saúde AnimalUniversidade Estadual Paulista Faculdade de Medicina Veterinária Produção e Saúde AnimalAssociação Brasileira de Divulgação Científica (ABRADIC)Universidade Estadual Paulista (Unesp)Nogueira, Guilherme de Paula [UNESP]2014-05-20T15:11:33Z2014-05-20T15:11:33Z2004-06-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article913-922application/pdfhttp://dx.doi.org/10.1590/S0100-879X2004000600018Brazilian Journal of Medical and Biological Research. Associação Brasileira de Divulgação Científica, v. 37, n. 6, p. 913-922, 2004.0100-879Xhttp://hdl.handle.net/11449/2807610.1590/S0100-879X2004000600018S0100-879X2004000600018S0100-879X2004000600018.pdf6926188473133379SciELOreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengBrazilian Journal of Medical and Biological Research1.492info:eu-repo/semantics/openAccess2023-12-11T06:14:15Zoai:repositorio.unesp.br:11449/28076Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-12-11T06:14:15Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Follicle profile and plasma gonadotropin concentration in pubertal female ponies |
title |
Follicle profile and plasma gonadotropin concentration in pubertal female ponies |
spellingShingle |
Follicle profile and plasma gonadotropin concentration in pubertal female ponies Nogueira, Guilherme de Paula [UNESP] Follicles FSH LH and prepubertal fillies |
title_short |
Follicle profile and plasma gonadotropin concentration in pubertal female ponies |
title_full |
Follicle profile and plasma gonadotropin concentration in pubertal female ponies |
title_fullStr |
Follicle profile and plasma gonadotropin concentration in pubertal female ponies |
title_full_unstemmed |
Follicle profile and plasma gonadotropin concentration in pubertal female ponies |
title_sort |
Follicle profile and plasma gonadotropin concentration in pubertal female ponies |
author |
Nogueira, Guilherme de Paula [UNESP] |
author_facet |
Nogueira, Guilherme de Paula [UNESP] |
author_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Nogueira, Guilherme de Paula [UNESP] |
dc.subject.por.fl_str_mv |
Follicles FSH LH and prepubertal fillies |
topic |
Follicles FSH LH and prepubertal fillies |
description |
Twelve female ponies were examined daily for 30 days and classified as ovulating (OV; N = 6; 197 ± 6 kg) or prepubertal (PP; N = 6; 196 ± 9 kg). Follicles were detected by ultrasound and gonadotropins quantified by radioimmunoassay. The mean diameter of the largest follicles was significantly larger in OV (38 ± 1 mm) than in PP (26 ± 2 mm) but there was no difference between groups in the size of the second largest follicle. There were more small follicles (<24 mm) in the PP than in the OV group, but PP fillies had a smaller number of follicles >29 mm than the OV fillies. Follicle-stimulating hormone (FSH) levels did not differ between groups but PP fillies had lower luteinizing hormone (LH) peak (8 ± 1 ng/ml) and basal (4 ± 0.5 ng/ml) levels, lower peak magnitude (2 ± 0.2 ng/ml) and period average (5 ± 0.6 ng/ml) than OV fillies (32 ± 4.5, 8 ± 1.2, 17.1 ± 6, and 15 ± 2.3 ng/ml, respectively). The PP group, in contrast to the OV group, showed no relationship between FSH surge and follicle wave emergence. We conclude that an LH concentration higher than 8 ng/ml is needed for follicle growth to a preovulatory size. Wave emergence and FSH secretion seem to be independent events, probably due to an inhibitory neural system in these PP animals. PP fillies may provide a physiological model for the study of follicle wave emergence which apparently does not depend on gonadotropin levels. |
publishDate |
2004 |
dc.date.none.fl_str_mv |
2004-06-01 2014-05-20T15:11:33Z 2014-05-20T15:11:33Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1590/S0100-879X2004000600018 Brazilian Journal of Medical and Biological Research. Associação Brasileira de Divulgação Científica, v. 37, n. 6, p. 913-922, 2004. 0100-879X http://hdl.handle.net/11449/28076 10.1590/S0100-879X2004000600018 S0100-879X2004000600018 S0100-879X2004000600018.pdf 6926188473133379 |
url |
http://dx.doi.org/10.1590/S0100-879X2004000600018 http://hdl.handle.net/11449/28076 |
identifier_str_mv |
Brazilian Journal of Medical and Biological Research. Associação Brasileira de Divulgação Científica, v. 37, n. 6, p. 913-922, 2004. 0100-879X 10.1590/S0100-879X2004000600018 S0100-879X2004000600018 S0100-879X2004000600018.pdf 6926188473133379 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Brazilian Journal of Medical and Biological Research 1.492 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
913-922 application/pdf |
dc.publisher.none.fl_str_mv |
Associação Brasileira de Divulgação Científica (ABRADIC) |
publisher.none.fl_str_mv |
Associação Brasileira de Divulgação Científica (ABRADIC) |
dc.source.none.fl_str_mv |
SciELO reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1803649955292774400 |