Time of ovulation in nulliparous and multiparous goats

Detalhes bibliográficos
Autor(a) principal: Simões, João
Data de Publicação: 2008
Outros Autores: Baril, Gérard, Almeida, José Carlos, Azevedo, Jorge Manuel Teixeira de, Fontes, Paulo J., Mascarenhas, R.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10348/1736
Resumo: Fifteen nulliparous and nine multiparous Serrana goats were used, through two successive oestrous cycles, in order to characterize their ovulation time with regard to the number of ovulations after induced and natural oestrus during the breeding season. The onset of oestrus was detected by the amount of vasectomized bucks after oestrus synchronization with prostaglandin, given 10 days apart, and in the following two expected natural oestrus. The preovulatory LH peak was determined from blood samples collected 0, 4, 8, 12 16, 20 and 24 h after onset of oestrus. A transrectal ovarian ultrasound scanning was performed 20, 24, 28, 32, 36, 40, 44 and 60h after onset of oestrus, for the detection of ovulations by means of the disappearance of large follicles (>4 to 5 mm). Single ovulations were observed in 76% of oestrous periods in nulliparous goats and in 18% of nulliparous goats. The onset of oestrus to LH peak interval was lower in nulliparous (12.1 +/- 0.9 h, n = 38) than in multiparous (15.6 +/- 1.0h, n = 22, P 0.05) goats with no oestrus interaction effects (P > 0.05). The LH peak to first ovulation interval was higher after natural (18.9 +/- 0.7h, n = 36) than after induced (15.8 +/- 1.2h, n = 24, P < 0.05) oestrus. The onset of oestrus to total ovulation interval was influenced by parity (P < 0.01) and oestrus type (P < 0.05) with a length of 30.1 +/- 1.1 h (n = 15) and 33.4 +/- 1.5h (n = 9) for induced oestrus of nulliparous and multiparous goats, respectively, and 32.5 +/- 1.0h (h = 23) and 36.5 +/- 1.1 h (n = 13) for natural oestrus of nulliparous and multiparous goats, respectively. The onset of oestrus to first ovulation interval was not influenced by parity, but an interval of 8.0 +/- 1.6 h was observed between the first and second ovulations in polyovulatory oestrus. Consequently, nulliparous goats that are predominantly monovular ovulate earlier than multiparous goats that are predominantly polyovulatory. In conclusion, significant differences occurred in the number and time of ovulations between nulliparous and multiparous goats. More research is necessary for a deeper understanding of the mechanisms regulating monovularory and polyovulatory oestrous cycles regarding the parity of goats.
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spelling Time of ovulation in nulliparous and multiparous goatsovulationluteinizing hormoneultrasonographyoestrusgoatsFifteen nulliparous and nine multiparous Serrana goats were used, through two successive oestrous cycles, in order to characterize their ovulation time with regard to the number of ovulations after induced and natural oestrus during the breeding season. The onset of oestrus was detected by the amount of vasectomized bucks after oestrus synchronization with prostaglandin, given 10 days apart, and in the following two expected natural oestrus. The preovulatory LH peak was determined from blood samples collected 0, 4, 8, 12 16, 20 and 24 h after onset of oestrus. A transrectal ovarian ultrasound scanning was performed 20, 24, 28, 32, 36, 40, 44 and 60h after onset of oestrus, for the detection of ovulations by means of the disappearance of large follicles (>4 to 5 mm). Single ovulations were observed in 76% of oestrous periods in nulliparous goats and in 18% of nulliparous goats. The onset of oestrus to LH peak interval was lower in nulliparous (12.1 +/- 0.9 h, n = 38) than in multiparous (15.6 +/- 1.0h, n = 22, P 0.05) goats with no oestrus interaction effects (P > 0.05). The LH peak to first ovulation interval was higher after natural (18.9 +/- 0.7h, n = 36) than after induced (15.8 +/- 1.2h, n = 24, P < 0.05) oestrus. The onset of oestrus to total ovulation interval was influenced by parity (P < 0.01) and oestrus type (P < 0.05) with a length of 30.1 +/- 1.1 h (n = 15) and 33.4 +/- 1.5h (n = 9) for induced oestrus of nulliparous and multiparous goats, respectively, and 32.5 +/- 1.0h (h = 23) and 36.5 +/- 1.1 h (n = 13) for natural oestrus of nulliparous and multiparous goats, respectively. The onset of oestrus to first ovulation interval was not influenced by parity, but an interval of 8.0 +/- 1.6 h was observed between the first and second ovulations in polyovulatory oestrus. Consequently, nulliparous goats that are predominantly monovular ovulate earlier than multiparous goats that are predominantly polyovulatory. In conclusion, significant differences occurred in the number and time of ovulations between nulliparous and multiparous goats. More research is necessary for a deeper understanding of the mechanisms regulating monovularory and polyovulatory oestrous cycles regarding the parity of goats.CAMBRIDGE UNIV PRESS2012-04-04T14:33:45Z2008-01-01T00:00:00Z2008info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10348/1736eng1751-7311Simões, JoãoBaril, GérardAlmeida, José CarlosAzevedo, Jorge Manuel Teixeira deFontes, Paulo J.Mascarenhas, R.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-02T12:50:42Zoai:repositorio.utad.pt:10348/1736Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:05:07.153258Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Time of ovulation in nulliparous and multiparous goats
title Time of ovulation in nulliparous and multiparous goats
spellingShingle Time of ovulation in nulliparous and multiparous goats
Simões, João
ovulation
luteinizing hormone
ultrasonography
oestrus
goats
title_short Time of ovulation in nulliparous and multiparous goats
title_full Time of ovulation in nulliparous and multiparous goats
title_fullStr Time of ovulation in nulliparous and multiparous goats
title_full_unstemmed Time of ovulation in nulliparous and multiparous goats
title_sort Time of ovulation in nulliparous and multiparous goats
author Simões, João
author_facet Simões, João
Baril, Gérard
Almeida, José Carlos
Azevedo, Jorge Manuel Teixeira de
Fontes, Paulo J.
Mascarenhas, R.
author_role author
author2 Baril, Gérard
Almeida, José Carlos
Azevedo, Jorge Manuel Teixeira de
Fontes, Paulo J.
Mascarenhas, R.
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Simões, João
Baril, Gérard
Almeida, José Carlos
Azevedo, Jorge Manuel Teixeira de
Fontes, Paulo J.
Mascarenhas, R.
dc.subject.por.fl_str_mv ovulation
luteinizing hormone
ultrasonography
oestrus
goats
topic ovulation
luteinizing hormone
ultrasonography
oestrus
goats
description Fifteen nulliparous and nine multiparous Serrana goats were used, through two successive oestrous cycles, in order to characterize their ovulation time with regard to the number of ovulations after induced and natural oestrus during the breeding season. The onset of oestrus was detected by the amount of vasectomized bucks after oestrus synchronization with prostaglandin, given 10 days apart, and in the following two expected natural oestrus. The preovulatory LH peak was determined from blood samples collected 0, 4, 8, 12 16, 20 and 24 h after onset of oestrus. A transrectal ovarian ultrasound scanning was performed 20, 24, 28, 32, 36, 40, 44 and 60h after onset of oestrus, for the detection of ovulations by means of the disappearance of large follicles (>4 to 5 mm). Single ovulations were observed in 76% of oestrous periods in nulliparous goats and in 18% of nulliparous goats. The onset of oestrus to LH peak interval was lower in nulliparous (12.1 +/- 0.9 h, n = 38) than in multiparous (15.6 +/- 1.0h, n = 22, P 0.05) goats with no oestrus interaction effects (P > 0.05). The LH peak to first ovulation interval was higher after natural (18.9 +/- 0.7h, n = 36) than after induced (15.8 +/- 1.2h, n = 24, P < 0.05) oestrus. The onset of oestrus to total ovulation interval was influenced by parity (P < 0.01) and oestrus type (P < 0.05) with a length of 30.1 +/- 1.1 h (n = 15) and 33.4 +/- 1.5h (n = 9) for induced oestrus of nulliparous and multiparous goats, respectively, and 32.5 +/- 1.0h (h = 23) and 36.5 +/- 1.1 h (n = 13) for natural oestrus of nulliparous and multiparous goats, respectively. The onset of oestrus to first ovulation interval was not influenced by parity, but an interval of 8.0 +/- 1.6 h was observed between the first and second ovulations in polyovulatory oestrus. Consequently, nulliparous goats that are predominantly monovular ovulate earlier than multiparous goats that are predominantly polyovulatory. In conclusion, significant differences occurred in the number and time of ovulations between nulliparous and multiparous goats. More research is necessary for a deeper understanding of the mechanisms regulating monovularory and polyovulatory oestrous cycles regarding the parity of goats.
publishDate 2008
dc.date.none.fl_str_mv 2008-01-01T00:00:00Z
2008
2012-04-04T14:33:45Z
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://hdl.handle.net/10348/1736
url http://hdl.handle.net/10348/1736
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 1751-7311
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 CAMBRIDGE UNIV PRESS
publisher.none.fl_str_mv CAMBRIDGE UNIV PRESS
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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