Effects of GnRH administration on ovulation and fertility in ewes subjected to estrous synchronization.
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
Texto Completo: | http://www.alice.cnptia.embrapa.br/alice/handle/doc/929671 http://dx.doi.org/10.1590/S1516-35982012000600014 |
Resumo: | Abstract: The objective of this study was to verify the effects of GnRH on ovulation and pregnancy of ewes subjected to a short-term synchronization of estrus. Santa Inês and crossbred Santa Inês/Dorper ewes received 60 mg MAP sponges during 6 days plus 300 IU eCG and 30 µg d-cloprostenol 24 h prior to sponge withdrawal (SW). Ewes were assigned to receive 0.9% NaCl solution (Tcontrol; n = 32) or 25 µg GnRH (licerelin, TGnRH; n = 34) 24 hours after SW. Each group was assigned to intrauterine insemination by laparoscopy (n = 25) or to natural mating (n = 41). Artificial insemination was performed with a single dose of fresh semen. For controlled mating, females were exposed to males 12, 24, 36 and 48 hours after SW. Ten females per treatment were subjected to transrectal ultrasound examination at 12-hour intervals (SW to 60 hours after). Estrous response (100.0% vs 95.2%), interval from SW to estrus (32.9±7.4 vs 29.8±6.9 hours), estrous length (37.4±9.0 vs 31.5±10.4 hours), pregnancy rates (57.0% vs 41.0%), ovulation rate (100.0% vs 90.0%), number of ovulations/ewe (1.1±0.3 vs 1.2±0.4), maximum follicular diameter (6.4±0.7 vs 6.1±0.6 mm), interval from SW to ovulation (59.1±3.5 vs 58.4±3.5 hours) did not differ between Tcontrol and TGnRH, respectively. Administration of GnRH 24 hours after SW does not improve ovulation or pregnancy rate in estrous synchronization in ewes. |
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Effects of GnRH administration on ovulation and fertility in ewes subjected to estrous synchronization.Raça Santa InêsIntravaginal progesterone insertTaxa de prenhezOestrus synchronizationOvinoReprodução animalInseminação artificialProgesteronaSincronização do cioCiclo estralOvulaçãoSheepArtificial inseminationOvulationProgesteronepregnancy rateAbstract: The objective of this study was to verify the effects of GnRH on ovulation and pregnancy of ewes subjected to a short-term synchronization of estrus. Santa Inês and crossbred Santa Inês/Dorper ewes received 60 mg MAP sponges during 6 days plus 300 IU eCG and 30 µg d-cloprostenol 24 h prior to sponge withdrawal (SW). Ewes were assigned to receive 0.9% NaCl solution (Tcontrol; n = 32) or 25 µg GnRH (licerelin, TGnRH; n = 34) 24 hours after SW. Each group was assigned to intrauterine insemination by laparoscopy (n = 25) or to natural mating (n = 41). Artificial insemination was performed with a single dose of fresh semen. For controlled mating, females were exposed to males 12, 24, 36 and 48 hours after SW. Ten females per treatment were subjected to transrectal ultrasound examination at 12-hour intervals (SW to 60 hours after). Estrous response (100.0% vs 95.2%), interval from SW to estrus (32.9±7.4 vs 29.8±6.9 hours), estrous length (37.4±9.0 vs 31.5±10.4 hours), pregnancy rates (57.0% vs 41.0%), ovulation rate (100.0% vs 90.0%), number of ovulations/ewe (1.1±0.3 vs 1.2±0.4), maximum follicular diameter (6.4±0.7 vs 6.1±0.6 mm), interval from SW to ovulation (59.1±3.5 vs 58.4±3.5 hours) did not differ between Tcontrol and TGnRH, respectively. Administration of GnRH 24 hours after SW does not improve ovulation or pregnancy rate in estrous synchronization in ewes.Amanda dos Santos Cavalcanti, Pós-graduação, Universidade Federal Fluminense, Niterói, RJ, Brasil.; Felipe Zandonadi Brandão, UFF, Niterói, RJ.; Luiz Altamiro Garcia Nogueira, UFF, Niterói, RJ.; JEFERSON FERREIRA DA FONSECA, CNPC.CAVALCANTI, A. dos S.BRANDÃO, F. Z.NOGUEIRA, L. A. G.FONSECA, J. F. da2012-07-27T11:11:11Z2012-07-27T11:11:11Z2012-07-2720122015-05-26T11:11:11Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleRevista Brasileira de Zootecnia, Viçosa, MG, v. 41, n. 6, p. 1412-1418, Jun. 2012.http://www.alice.cnptia.embrapa.br/alice/handle/doc/929671http://dx.doi.org/10.1590/S1516-35982012000600014enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPA2017-08-15T22:23:24Zoai:www.alice.cnptia.embrapa.br:doc/929671Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestopendoar:21542017-08-15T22:23:24falseRepositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542017-08-15T22:23:24Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Effects of GnRH administration on ovulation and fertility in ewes subjected to estrous synchronization. |
title |
Effects of GnRH administration on ovulation and fertility in ewes subjected to estrous synchronization. |
spellingShingle |
Effects of GnRH administration on ovulation and fertility in ewes subjected to estrous synchronization. CAVALCANTI, A. dos S. Raça Santa Inês Intravaginal progesterone insert Taxa de prenhez Oestrus synchronization Ovino Reprodução animal Inseminação artificial Progesterona Sincronização do cio Ciclo estral Ovulação Sheep Artificial insemination Ovulation Progesterone pregnancy rate |
title_short |
Effects of GnRH administration on ovulation and fertility in ewes subjected to estrous synchronization. |
title_full |
Effects of GnRH administration on ovulation and fertility in ewes subjected to estrous synchronization. |
title_fullStr |
Effects of GnRH administration on ovulation and fertility in ewes subjected to estrous synchronization. |
title_full_unstemmed |
Effects of GnRH administration on ovulation and fertility in ewes subjected to estrous synchronization. |
title_sort |
Effects of GnRH administration on ovulation and fertility in ewes subjected to estrous synchronization. |
author |
CAVALCANTI, A. dos S. |
author_facet |
CAVALCANTI, A. dos S. BRANDÃO, F. Z. NOGUEIRA, L. A. G. FONSECA, J. F. da |
author_role |
author |
author2 |
BRANDÃO, F. Z. NOGUEIRA, L. A. G. FONSECA, J. F. da |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Amanda dos Santos Cavalcanti, Pós-graduação, Universidade Federal Fluminense, Niterói, RJ, Brasil.; Felipe Zandonadi Brandão, UFF, Niterói, RJ.; Luiz Altamiro Garcia Nogueira, UFF, Niterói, RJ.; JEFERSON FERREIRA DA FONSECA, CNPC. |
dc.contributor.author.fl_str_mv |
CAVALCANTI, A. dos S. BRANDÃO, F. Z. NOGUEIRA, L. A. G. FONSECA, J. F. da |
dc.subject.por.fl_str_mv |
Raça Santa Inês Intravaginal progesterone insert Taxa de prenhez Oestrus synchronization Ovino Reprodução animal Inseminação artificial Progesterona Sincronização do cio Ciclo estral Ovulação Sheep Artificial insemination Ovulation Progesterone pregnancy rate |
topic |
Raça Santa Inês Intravaginal progesterone insert Taxa de prenhez Oestrus synchronization Ovino Reprodução animal Inseminação artificial Progesterona Sincronização do cio Ciclo estral Ovulação Sheep Artificial insemination Ovulation Progesterone pregnancy rate |
description |
Abstract: The objective of this study was to verify the effects of GnRH on ovulation and pregnancy of ewes subjected to a short-term synchronization of estrus. Santa Inês and crossbred Santa Inês/Dorper ewes received 60 mg MAP sponges during 6 days plus 300 IU eCG and 30 µg d-cloprostenol 24 h prior to sponge withdrawal (SW). Ewes were assigned to receive 0.9% NaCl solution (Tcontrol; n = 32) or 25 µg GnRH (licerelin, TGnRH; n = 34) 24 hours after SW. Each group was assigned to intrauterine insemination by laparoscopy (n = 25) or to natural mating (n = 41). Artificial insemination was performed with a single dose of fresh semen. For controlled mating, females were exposed to males 12, 24, 36 and 48 hours after SW. Ten females per treatment were subjected to transrectal ultrasound examination at 12-hour intervals (SW to 60 hours after). Estrous response (100.0% vs 95.2%), interval from SW to estrus (32.9±7.4 vs 29.8±6.9 hours), estrous length (37.4±9.0 vs 31.5±10.4 hours), pregnancy rates (57.0% vs 41.0%), ovulation rate (100.0% vs 90.0%), number of ovulations/ewe (1.1±0.3 vs 1.2±0.4), maximum follicular diameter (6.4±0.7 vs 6.1±0.6 mm), interval from SW to ovulation (59.1±3.5 vs 58.4±3.5 hours) did not differ between Tcontrol and TGnRH, respectively. Administration of GnRH 24 hours after SW does not improve ovulation or pregnancy rate in estrous synchronization in ewes. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-07-27T11:11:11Z 2012-07-27T11:11:11Z 2012-07-27 2012 2015-05-26T11:11:11Z |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
Revista Brasileira de Zootecnia, Viçosa, MG, v. 41, n. 6, p. 1412-1418, Jun. 2012. http://www.alice.cnptia.embrapa.br/alice/handle/doc/929671 http://dx.doi.org/10.1590/S1516-35982012000600014 |
identifier_str_mv |
Revista Brasileira de Zootecnia, Viçosa, MG, v. 41, n. 6, p. 1412-1418, Jun. 2012. |
url |
http://www.alice.cnptia.embrapa.br/alice/handle/doc/929671 http://dx.doi.org/10.1590/S1516-35982012000600014 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
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Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
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EMBRAPA |
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EMBRAPA |
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Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
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Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
repository.name.fl_str_mv |
Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
repository.mail.fl_str_mv |
cg-riaa@embrapa.br |
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