Effects of GnRH administration on ovulation and fertility in ewes subjected to estrous synchronization.

Detalhes bibliográficos
Autor(a) principal: CAVALCANTI, A. dos S.
Data de Publicação: 2012
Outros Autores: BRANDÃO, F. Z., NOGUEIRA, L. A. G., FONSECA, J. F. da
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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spelling 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
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
collection 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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