Characterizing emergence and divergence in the first follicular wave in a tropically adapted Bos taurus breed
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.theriogenology.2016.09.041 http://hdl.handle.net/11449/165392 |
Resumo: | Tropically adapted Bos taurus breeds are descended from the cattle which were brought from the Iberian Peninsula to Latin America by the colonizers and which adapted over time to local conditions. These breeds have become a genetic treasure that must be preserved. The objective of this study was to characterize ovarian follicular emergence and divergence in tropically adapted B. taurus cows and heifers. Cyclic heifers (n = 11) and nonlactating, multiparous cows (n = 11) were examined at 8-hour intervals using ultrasonography starting on the day following the final application of PGF(2 alpha), which was used to synchronize the estrous cycle, and ending 5 days after ovulation. Blood samples were collected immediately following the ultrasonographic examinations in order to evaluate FSH and estradiol-17 beta (E-2) concentrations. The interval between ovulation and follicular wave emergence (11.6 +/- 3.3 hours vs. 203 +/- 2.5 hours, P < 0.05) and ovulation and follicular wave divergence (52.4 +/- 5.2 hours vs. 71.8 +/- 4.1 hours, P < 0.05) was shorter in the cows than in the heifers, respectively. Plasma FSH concentrations increased (P.< 0.05) and serum E-2 concentrations decreased earlier in cows than in heifers before ovulation. Following follicular wave emergence, no difference in follicular development was found between the cows and the heifers. Consequently, following follicular wave emergence, the data from both the cows and the heifers were combined and categorized by dominant follicle (DF) and second largest follicle (SF). The DF and SF were identified at the same time (P > 0.05). The mean number of small (<= 4 mm, 7.2 +/- 5.1) and medium (4 to <= 8 mm, 6.8 +/- 3.5) follicles was greater than that of large follicles (>= 8 mm, 0.6 +/- 0.5) from ovulation until 5 days after ovulation. The DF diameter (8.1 +/- 1 mm) did not differ (P = 0.09) from SF diameter (7.6 +/- 0.9 mm) at the time of follicular divergence (around 45 hours after follicular emergence). The DF and SF growth rates were similar (P > 0.05) until follicular divergence, at which point the SF growth rate decreased, whereas the DF growth rate remained constant. Serum E-2 concentrations did not change (P > 0.05) during the divergence period, whereas FSH concentrations decreased between 48 and 32 hours before follicular wave divergence. In conclusion, cows and heifers differed only in the interval from ovulation to follicular wave emergence and divergence, which was confirmed by the different patterns of FSH and E-2 concentrations. (C) 2016 Elsevier Inc. All rights reserved. |
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Characterizing emergence and divergence in the first follicular wave in a tropically adapted Bos taurus breedConservationCurraleiro Pe-DuroDominant follicleEstradiol 17-betaFSHTropically adapted Bos taurus breeds are descended from the cattle which were brought from the Iberian Peninsula to Latin America by the colonizers and which adapted over time to local conditions. These breeds have become a genetic treasure that must be preserved. The objective of this study was to characterize ovarian follicular emergence and divergence in tropically adapted B. taurus cows and heifers. Cyclic heifers (n = 11) and nonlactating, multiparous cows (n = 11) were examined at 8-hour intervals using ultrasonography starting on the day following the final application of PGF(2 alpha), which was used to synchronize the estrous cycle, and ending 5 days after ovulation. Blood samples were collected immediately following the ultrasonographic examinations in order to evaluate FSH and estradiol-17 beta (E-2) concentrations. The interval between ovulation and follicular wave emergence (11.6 +/- 3.3 hours vs. 203 +/- 2.5 hours, P < 0.05) and ovulation and follicular wave divergence (52.4 +/- 5.2 hours vs. 71.8 +/- 4.1 hours, P < 0.05) was shorter in the cows than in the heifers, respectively. Plasma FSH concentrations increased (P.< 0.05) and serum E-2 concentrations decreased earlier in cows than in heifers before ovulation. Following follicular wave emergence, no difference in follicular development was found between the cows and the heifers. Consequently, following follicular wave emergence, the data from both the cows and the heifers were combined and categorized by dominant follicle (DF) and second largest follicle (SF). The DF and SF were identified at the same time (P > 0.05). The mean number of small (<= 4 mm, 7.2 +/- 5.1) and medium (4 to <= 8 mm, 6.8 +/- 3.5) follicles was greater than that of large follicles (>= 8 mm, 0.6 +/- 0.5) from ovulation until 5 days after ovulation. The DF diameter (8.1 +/- 1 mm) did not differ (P = 0.09) from SF diameter (7.6 +/- 0.9 mm) at the time of follicular divergence (around 45 hours after follicular emergence). The DF and SF growth rates were similar (P > 0.05) until follicular divergence, at which point the SF growth rate decreased, whereas the DF growth rate remained constant. Serum E-2 concentrations did not change (P > 0.05) during the divergence period, whereas FSH concentrations decreased between 48 and 32 hours before follicular wave divergence. In conclusion, cows and heifers differed only in the interval from ovulation to follicular wave emergence and divergence, which was confirmed by the different patterns of FSH and E-2 concentrations. (C) 2016 Elsevier Inc. All rights reserved.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)FAPDFUniv Brasilia, Dept Agron & Med Vet, Brasilia, DF, BrazilUniv Estadual Paulista, Dept Vet Med, Aracatuba, SP, BrazilFac Integradas Uniao Educ Planalto, Dept Vet Med, Gama, DF, BrazilEmbrapa Recursos Genet & Biotecnol, Dept Conservacao Recursos Genet Anim, Brasilia, DF, BrazilUniv Estadual Paulista, Dept Vet Med, Aracatuba, SP, BrazilCNPq: 473611/2012-0FAPDF: 193.000.463/2011Elsevier B.V.Universidade de Brasília (UnB)Universidade Estadual Paulista (Unesp)Fac Integradas Uniao Educ PlanaltoEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA)Tortorella, Rodrigo DornelesNogueira, Guilherme de Paula [UNESP]Modesto, Mairon RochaPassoni Silva, Priscilla CristineSilva, Joseane Padilha daNeves, Jairo PereiraRamos, Alexandre Floriani2018-11-28T00:18:32Z2018-11-28T00:18:32Z2017-01-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article9-17application/pdfhttp://dx.doi.org/10.1016/j.theriogenology.2016.09.041Theriogenology. New York: Elsevier Science Inc, v. 88, p. 9-17, 2017.0093-691Xhttp://hdl.handle.net/11449/16539210.1016/j.theriogenology.2016.09.041WOS:000389095900002WOS000389095900002.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengTheriogenologyinfo:eu-repo/semantics/openAccess2024-09-04T19:15:26Zoai:repositorio.unesp.br:11449/165392Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestrepositoriounesp@unesp.bropendoar:29462024-09-04T19:15:26Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Characterizing emergence and divergence in the first follicular wave in a tropically adapted Bos taurus breed |
title |
Characterizing emergence and divergence in the first follicular wave in a tropically adapted Bos taurus breed |
spellingShingle |
Characterizing emergence and divergence in the first follicular wave in a tropically adapted Bos taurus breed Tortorella, Rodrigo Dorneles Conservation Curraleiro Pe-Duro Dominant follicle Estradiol 17-beta FSH |
title_short |
Characterizing emergence and divergence in the first follicular wave in a tropically adapted Bos taurus breed |
title_full |
Characterizing emergence and divergence in the first follicular wave in a tropically adapted Bos taurus breed |
title_fullStr |
Characterizing emergence and divergence in the first follicular wave in a tropically adapted Bos taurus breed |
title_full_unstemmed |
Characterizing emergence and divergence in the first follicular wave in a tropically adapted Bos taurus breed |
title_sort |
Characterizing emergence and divergence in the first follicular wave in a tropically adapted Bos taurus breed |
author |
Tortorella, Rodrigo Dorneles |
author_facet |
Tortorella, Rodrigo Dorneles Nogueira, Guilherme de Paula [UNESP] Modesto, Mairon Rocha Passoni Silva, Priscilla Cristine Silva, Joseane Padilha da Neves, Jairo Pereira Ramos, Alexandre Floriani |
author_role |
author |
author2 |
Nogueira, Guilherme de Paula [UNESP] Modesto, Mairon Rocha Passoni Silva, Priscilla Cristine Silva, Joseane Padilha da Neves, Jairo Pereira Ramos, Alexandre Floriani |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade de Brasília (UnB) Universidade Estadual Paulista (Unesp) Fac Integradas Uniao Educ Planalto Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) |
dc.contributor.author.fl_str_mv |
Tortorella, Rodrigo Dorneles Nogueira, Guilherme de Paula [UNESP] Modesto, Mairon Rocha Passoni Silva, Priscilla Cristine Silva, Joseane Padilha da Neves, Jairo Pereira Ramos, Alexandre Floriani |
dc.subject.por.fl_str_mv |
Conservation Curraleiro Pe-Duro Dominant follicle Estradiol 17-beta FSH |
topic |
Conservation Curraleiro Pe-Duro Dominant follicle Estradiol 17-beta FSH |
description |
Tropically adapted Bos taurus breeds are descended from the cattle which were brought from the Iberian Peninsula to Latin America by the colonizers and which adapted over time to local conditions. These breeds have become a genetic treasure that must be preserved. The objective of this study was to characterize ovarian follicular emergence and divergence in tropically adapted B. taurus cows and heifers. Cyclic heifers (n = 11) and nonlactating, multiparous cows (n = 11) were examined at 8-hour intervals using ultrasonography starting on the day following the final application of PGF(2 alpha), which was used to synchronize the estrous cycle, and ending 5 days after ovulation. Blood samples were collected immediately following the ultrasonographic examinations in order to evaluate FSH and estradiol-17 beta (E-2) concentrations. The interval between ovulation and follicular wave emergence (11.6 +/- 3.3 hours vs. 203 +/- 2.5 hours, P < 0.05) and ovulation and follicular wave divergence (52.4 +/- 5.2 hours vs. 71.8 +/- 4.1 hours, P < 0.05) was shorter in the cows than in the heifers, respectively. Plasma FSH concentrations increased (P.< 0.05) and serum E-2 concentrations decreased earlier in cows than in heifers before ovulation. Following follicular wave emergence, no difference in follicular development was found between the cows and the heifers. Consequently, following follicular wave emergence, the data from both the cows and the heifers were combined and categorized by dominant follicle (DF) and second largest follicle (SF). The DF and SF were identified at the same time (P > 0.05). The mean number of small (<= 4 mm, 7.2 +/- 5.1) and medium (4 to <= 8 mm, 6.8 +/- 3.5) follicles was greater than that of large follicles (>= 8 mm, 0.6 +/- 0.5) from ovulation until 5 days after ovulation. The DF diameter (8.1 +/- 1 mm) did not differ (P = 0.09) from SF diameter (7.6 +/- 0.9 mm) at the time of follicular divergence (around 45 hours after follicular emergence). The DF and SF growth rates were similar (P > 0.05) until follicular divergence, at which point the SF growth rate decreased, whereas the DF growth rate remained constant. Serum E-2 concentrations did not change (P > 0.05) during the divergence period, whereas FSH concentrations decreased between 48 and 32 hours before follicular wave divergence. In conclusion, cows and heifers differed only in the interval from ovulation to follicular wave emergence and divergence, which was confirmed by the different patterns of FSH and E-2 concentrations. (C) 2016 Elsevier Inc. All rights reserved. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-01-15 2018-11-28T00:18:32Z 2018-11-28T00:18:32Z |
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/10.1016/j.theriogenology.2016.09.041 Theriogenology. New York: Elsevier Science Inc, v. 88, p. 9-17, 2017. 0093-691X http://hdl.handle.net/11449/165392 10.1016/j.theriogenology.2016.09.041 WOS:000389095900002 WOS000389095900002.pdf |
url |
http://dx.doi.org/10.1016/j.theriogenology.2016.09.041 http://hdl.handle.net/11449/165392 |
identifier_str_mv |
Theriogenology. New York: Elsevier Science Inc, v. 88, p. 9-17, 2017. 0093-691X 10.1016/j.theriogenology.2016.09.041 WOS:000389095900002 WOS000389095900002.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Theriogenology |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
9-17 application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier B.V. |
publisher.none.fl_str_mv |
Elsevier B.V. |
dc.source.none.fl_str_mv |
Web of Science 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 |
repositoriounesp@unesp.br |
_version_ |
1810021383420248064 |