Follicular dynamics in Serrana goats

Detalhes bibliográficos
Autor(a) principal: Simões, João
Data de Publicação: 2006
Outros Autores: Almeida, José Carlos, Valentim, Ramiro, Baril, Gérard, Azevedo, Jorge Manuel Teixeira de, Fontes, Paulo J., Mascarenhas, Ramiro
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10348/1568
Resumo: Twenty-two Serrana goats were studied through two successive estrous cycles in order to characterize their follicular dynamics during the breeding season. The ovaries of the goats were scanned daily by realtime ultrasonography and all follicles ≥3mm were measured and classified. The data were classified by the number of follicular waves per goat to test the hypothesis that temporal and morphological differences between the last follicular wave of an ovary, irrespective of ovulation, will affect the selection of the next ovulatory wave. The mean interovulatory interval was 20.7±1.0 days (mean±S.D.). Three to five waves per estrous cycle were observed and 61.3% (19/31) of cycles had fourwaves. In estrous cycles with fourwaves, the day of onset of the first, second, third and fourth wave was 1.4±1.0, 6.9±1.4, 11.6±1.8 and 16.8±1.6, respectively. No differences (P > 0.05) were found between the day of onset of the first and second waves for estrous cycles with three, four or five waves. However, the day of onset of the third and fourth waves occurred later when the number of waves per estrous cycle increased (P < 0.001). The duration of the interwave interval (time between the day of onset of two consecutive waves) was longer when the second wave was ovulatory. The length of the growth phase (2.4±0.9 days) and size (5.9±0.7 mm) of the dominant follicle in the second wave were lower (P < 0.01) than for the first wave (3.3±1.2 days and 6.6±0.9 mm, respectively) and the fifth wave (4.1±1.2 days and 7.5±1.0 mm, respectively). Within pairs of ovaries, the onset of the last wave occurred later (P < 0.05) and was less variable in ovulatory ovaries (day 16.8±1.4, n = 20) than in anovulatory ovaries (day 15.1±3.7, n = 20). The length of the growing phase was longer (P < 0.001) in the last waves of ovulatory ovaries (3.1±0.9 days) than in the last waves of anovulatory ovaries (1.7±0.8 days). These results support the hypothesis that the day of onset of the ovulatory wave is related to or, at least, conditioned by the luteolysis and the decrease in plasma progesterone. In summary, the estrous cycle of Serrana goats is characterized by sequential follicular wave growth with a great variability in their onset and duration, with the exception of the ovulatory wave. The temporal and morphological differences observed in the last wave of estrous cycle provide strong evidence for the role of progesterone in their regulation.
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spelling Follicular dynamics in Serrana goatsEstrous cycleFollicular dynamicsOvaryGoatUltrasonographyTwenty-two Serrana goats were studied through two successive estrous cycles in order to characterize their follicular dynamics during the breeding season. The ovaries of the goats were scanned daily by realtime ultrasonography and all follicles ≥3mm were measured and classified. The data were classified by the number of follicular waves per goat to test the hypothesis that temporal and morphological differences between the last follicular wave of an ovary, irrespective of ovulation, will affect the selection of the next ovulatory wave. The mean interovulatory interval was 20.7±1.0 days (mean±S.D.). Three to five waves per estrous cycle were observed and 61.3% (19/31) of cycles had fourwaves. In estrous cycles with fourwaves, the day of onset of the first, second, third and fourth wave was 1.4±1.0, 6.9±1.4, 11.6±1.8 and 16.8±1.6, respectively. No differences (P > 0.05) were found between the day of onset of the first and second waves for estrous cycles with three, four or five waves. However, the day of onset of the third and fourth waves occurred later when the number of waves per estrous cycle increased (P < 0.001). The duration of the interwave interval (time between the day of onset of two consecutive waves) was longer when the second wave was ovulatory. The length of the growth phase (2.4±0.9 days) and size (5.9±0.7 mm) of the dominant follicle in the second wave were lower (P < 0.01) than for the first wave (3.3±1.2 days and 6.6±0.9 mm, respectively) and the fifth wave (4.1±1.2 days and 7.5±1.0 mm, respectively). Within pairs of ovaries, the onset of the last wave occurred later (P < 0.05) and was less variable in ovulatory ovaries (day 16.8±1.4, n = 20) than in anovulatory ovaries (day 15.1±3.7, n = 20). The length of the growing phase was longer (P < 0.001) in the last waves of ovulatory ovaries (3.1±0.9 days) than in the last waves of anovulatory ovaries (1.7±0.8 days). These results support the hypothesis that the day of onset of the ovulatory wave is related to or, at least, conditioned by the luteolysis and the decrease in plasma progesterone. In summary, the estrous cycle of Serrana goats is characterized by sequential follicular wave growth with a great variability in their onset and duration, with the exception of the ovulatory wave. The temporal and morphological differences observed in the last wave of estrous cycle provide strong evidence for the role of progesterone in their regulation.Elsevier B.V.2012-02-09T16:09:42Z2006-01-01T00:00:00Z2006info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10348/1568eng0378-4320.95Simões, JoãoAlmeida, José CarlosValentim, RamiroBaril, GérardAzevedo, Jorge Manuel Teixeira deFontes, Paulo J.Mascarenhas, Ramiroinfo: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:RCAAP2024-02-02T12:40:39Zoai:repositorio.utad.pt:10348/1568Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:02:38.479367Repositório 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 Follicular dynamics in Serrana goats
title Follicular dynamics in Serrana goats
spellingShingle Follicular dynamics in Serrana goats
Simões, João
Estrous cycle
Follicular dynamics
Ovary
Goat
Ultrasonography
title_short Follicular dynamics in Serrana goats
title_full Follicular dynamics in Serrana goats
title_fullStr Follicular dynamics in Serrana goats
title_full_unstemmed Follicular dynamics in Serrana goats
title_sort Follicular dynamics in Serrana goats
author Simões, João
author_facet Simões, João
Almeida, José Carlos
Valentim, Ramiro
Baril, Gérard
Azevedo, Jorge Manuel Teixeira de
Fontes, Paulo J.
Mascarenhas, Ramiro
author_role author
author2 Almeida, José Carlos
Valentim, Ramiro
Baril, Gérard
Azevedo, Jorge Manuel Teixeira de
Fontes, Paulo J.
Mascarenhas, Ramiro
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv Simões, João
Almeida, José Carlos
Valentim, Ramiro
Baril, Gérard
Azevedo, Jorge Manuel Teixeira de
Fontes, Paulo J.
Mascarenhas, Ramiro
dc.subject.por.fl_str_mv Estrous cycle
Follicular dynamics
Ovary
Goat
Ultrasonography
topic Estrous cycle
Follicular dynamics
Ovary
Goat
Ultrasonography
description Twenty-two Serrana goats were studied through two successive estrous cycles in order to characterize their follicular dynamics during the breeding season. The ovaries of the goats were scanned daily by realtime ultrasonography and all follicles ≥3mm were measured and classified. The data were classified by the number of follicular waves per goat to test the hypothesis that temporal and morphological differences between the last follicular wave of an ovary, irrespective of ovulation, will affect the selection of the next ovulatory wave. The mean interovulatory interval was 20.7±1.0 days (mean±S.D.). Three to five waves per estrous cycle were observed and 61.3% (19/31) of cycles had fourwaves. In estrous cycles with fourwaves, the day of onset of the first, second, third and fourth wave was 1.4±1.0, 6.9±1.4, 11.6±1.8 and 16.8±1.6, respectively. No differences (P > 0.05) were found between the day of onset of the first and second waves for estrous cycles with three, four or five waves. However, the day of onset of the third and fourth waves occurred later when the number of waves per estrous cycle increased (P < 0.001). The duration of the interwave interval (time between the day of onset of two consecutive waves) was longer when the second wave was ovulatory. The length of the growth phase (2.4±0.9 days) and size (5.9±0.7 mm) of the dominant follicle in the second wave were lower (P < 0.01) than for the first wave (3.3±1.2 days and 6.6±0.9 mm, respectively) and the fifth wave (4.1±1.2 days and 7.5±1.0 mm, respectively). Within pairs of ovaries, the onset of the last wave occurred later (P < 0.05) and was less variable in ovulatory ovaries (day 16.8±1.4, n = 20) than in anovulatory ovaries (day 15.1±3.7, n = 20). The length of the growing phase was longer (P < 0.001) in the last waves of ovulatory ovaries (3.1±0.9 days) than in the last waves of anovulatory ovaries (1.7±0.8 days). These results support the hypothesis that the day of onset of the ovulatory wave is related to or, at least, conditioned by the luteolysis and the decrease in plasma progesterone. In summary, the estrous cycle of Serrana goats is characterized by sequential follicular wave growth with a great variability in their onset and duration, with the exception of the ovulatory wave. The temporal and morphological differences observed in the last wave of estrous cycle provide strong evidence for the role of progesterone in their regulation.
publishDate 2006
dc.date.none.fl_str_mv 2006-01-01T00:00:00Z
2006
2012-02-09T16:09:42Z
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/10348/1568
url http://hdl.handle.net/10348/1568
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 0378-4320.95
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 Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
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
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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