Follicular dynamics in dairy sheep within and out of the breeding season employing high or low progesterone concentration in estrous cycle synchronization

Detalhes bibliográficos
Autor(a) principal: Brogni, Cláudio Francisco
Data de Publicação: 2024
Outros Autores: Mezzalira, Alceu
Tipo de documento: Artigo
Idioma: por
eng
Título da fonte: Ciência animal brasileira (Online)
Texto Completo: https://revistas.ufg.br/vet/article/view/77084
Resumo: Follicular dynamics in dairy sheep is poorly understood. This study assessed thefollicular dynamics of dairy sheep within and out of the breeding season by observing theeffect of two progesterone concentrations (60 and 120 mg) used in vaginal pessaries inpre-synchronization. The experiment was conducted in April/May and October/Novemberusing 40 healthy multiparous dairy ewes predominantly of the Lacaune breed, whichunderwent daily transrectal ultrasound examinations. The number of ovulations (1.35 vs1.05), ovulatory follicle diameter (mm) (5.97 vs 5.05), length of the luteal phase (11 vs 9.14days), and length of the estrous cycle (16.83 vs 16.6 days) were assessed within and out ofthe breeding season, respectively. The sheep out of the breeding season did not present acorpus luteum at the time of insertion of the vaginal pessary, characterizing anestrus. Theovulatory follicle had a larger diameter in the breeding season even with the shorter lengthof the follicular phase, suggesting higher viability and quality of the ovulated oocyte. Theapplication of exogenous progesterone extends the luteal phase in the breeding season(11 vs 9.14 days). The anestrus observed out of season suggests the need for a higherprogesterone concentration in reproductive protocols. Therefore, breeding protocols canbe adapted for different seasons, suggesting the use of vaginal pessaries with a higherprogesterone concentration (120 mg) out of the breeding season. The data allowed thecharacterization of follicular dynamics in dairy sheep, demonstrating their differences ineach season based on the use of different progesterone doses in pre-synchronization.
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spelling Follicular dynamics in dairy sheep within and out of the breeding season employing high or low progesterone concentration in estrous cycle synchronizationDinâmica folicular em ovelhas leiteiras dentro e fora da estação reprodutiva, empregando alta ou baixa concentração de progesterona na sincronização do clico estralFollicular dynamics in dairy sheep is poorly understood. This study assessed thefollicular dynamics of dairy sheep within and out of the breeding season by observing theeffect of two progesterone concentrations (60 and 120 mg) used in vaginal pessaries inpre-synchronization. The experiment was conducted in April/May and October/Novemberusing 40 healthy multiparous dairy ewes predominantly of the Lacaune breed, whichunderwent daily transrectal ultrasound examinations. The number of ovulations (1.35 vs1.05), ovulatory follicle diameter (mm) (5.97 vs 5.05), length of the luteal phase (11 vs 9.14days), and length of the estrous cycle (16.83 vs 16.6 days) were assessed within and out ofthe breeding season, respectively. The sheep out of the breeding season did not present acorpus luteum at the time of insertion of the vaginal pessary, characterizing anestrus. Theovulatory follicle had a larger diameter in the breeding season even with the shorter lengthof the follicular phase, suggesting higher viability and quality of the ovulated oocyte. Theapplication of exogenous progesterone extends the luteal phase in the breeding season(11 vs 9.14 days). The anestrus observed out of season suggests the need for a higherprogesterone concentration in reproductive protocols. Therefore, breeding protocols canbe adapted for different seasons, suggesting the use of vaginal pessaries with a higherprogesterone concentration (120 mg) out of the breeding season. The data allowed thecharacterization of follicular dynamics in dairy sheep, demonstrating their differences ineach season based on the use of different progesterone doses in pre-synchronization.A dinâmica folicular em ovelhas leiteiras é pouco compreendida. Neste trabalho foi avaliado a dinâmica folicular de ovelhas leiteiras, dentro e fora da estação reprodutiva observando o efeito de duas concentrações de progesterona (60 e 120mg) utilizadas em pessários vaginais na pré-sincronização. O experimento foi realizado nos meses de abril/ maio e outubro/novembro, utilizando 40 ovelhas multíparas leiteiras hígidas, predominantemente da raça Lacaune, que foram submetidas a exames ultrassonográficos diários por via transretal. Na estação reprodutiva foram avaliados o número de ovulações (1,35 vs 1,05), o diâmetro(mm) do folículo ovulatório (5,97 vs 5,05), a duração da fase lútea (11 vs 9,14 dias) e a duração do ciclo estral (16,83 vs 16,6 dias) dentro da estação em comparação com fora da estação reprodutiva respectivamente. Fora da estação as ovelhas não apresentaram corpo lúteo no momento da inserção do pessário vaginal, caracterizando anestro. Mesmo com menor duração da fase folicular, o folículo ovulatório apresentou maior diâmetro na estação reprodutiva, sugerindo maior viabilidade e qualidade do oócito ovulado. A aplicação de progesterona exógena amplia a fase lútea na estação reprodutiva (11 vs 9,14 dias). O anestro observado fora de época sugere a necessidade de maior concentração de progesterona nos protocolos reprodutivos. Desta forma, é possível adaptar protocolos reprodutivos para diferentes épocas, sugerindo o uso de pessários vaginais com maior concentração de progesterona (120 mg) fora da estação reprodutiva. Os dados obtidos permitiram caracterizar a dinâmica folicular em ovelhas leiteiras, demonstrando suas diferenças em cada estação a partir do uso de diferentes doses de progesterona na pré-sincronização. Universidade Federal de Goiás2024-02-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://revistas.ufg.br/vet/article/view/77084Brazilian Animal Science/ Ciência Animal Brasileira; Vol. 25 (2024): Publicação continuaCiência Animal Brasileira / Brazilian Animal Science; v. 25 (2024): Publicação continua1809-68911518-2797reponame:Ciência animal brasileira (Online)instname:Universidade Federal de Goiás (UFG)instacron:UFGporenghttps://revistas.ufg.br/vet/article/view/77084/40779https://revistas.ufg.br/vet/article/view/77084/40780https://revistas.ufg.br/vet/article/view/77084/41019https://revistas.ufg.br/vet/article/view/77084/41020Copyright (c) 2024 Ciência Animal Brasileira / Brazilian Animal Sciencehttp://creativecommons.org/licenses/by/4.0info:eu-repo/semantics/openAccessBrogni, Cláudio FranciscoMezzalira, Alceu2024-05-21T14:15:04Zoai:ojs.revistas.ufg.br:article/77084Revistahttps://revistas.ufg.br/vetPUBhttps://revistas.ufg.br/vet/oai||revistacab@gmail.com1809-68911518-2797opendoar:2024-05-21T19:56:38.750345Ciência animal brasileira (Online) - Universidade Federal de Goiás (UFG)true
dc.title.none.fl_str_mv Follicular dynamics in dairy sheep within and out of the breeding season employing high or low progesterone concentration in estrous cycle synchronization
Dinâmica folicular em ovelhas leiteiras dentro e fora da estação reprodutiva, empregando alta ou baixa concentração de progesterona na sincronização do clico estral
title Follicular dynamics in dairy sheep within and out of the breeding season employing high or low progesterone concentration in estrous cycle synchronization
spellingShingle Follicular dynamics in dairy sheep within and out of the breeding season employing high or low progesterone concentration in estrous cycle synchronization
Brogni, Cláudio Francisco
title_short Follicular dynamics in dairy sheep within and out of the breeding season employing high or low progesterone concentration in estrous cycle synchronization
title_full Follicular dynamics in dairy sheep within and out of the breeding season employing high or low progesterone concentration in estrous cycle synchronization
title_fullStr Follicular dynamics in dairy sheep within and out of the breeding season employing high or low progesterone concentration in estrous cycle synchronization
title_full_unstemmed Follicular dynamics in dairy sheep within and out of the breeding season employing high or low progesterone concentration in estrous cycle synchronization
title_sort Follicular dynamics in dairy sheep within and out of the breeding season employing high or low progesterone concentration in estrous cycle synchronization
author Brogni, Cláudio Francisco
author_facet Brogni, Cláudio Francisco
Mezzalira, Alceu
author_role author
author2 Mezzalira, Alceu
author2_role author
dc.contributor.author.fl_str_mv Brogni, Cláudio Francisco
Mezzalira, Alceu
description Follicular dynamics in dairy sheep is poorly understood. This study assessed thefollicular dynamics of dairy sheep within and out of the breeding season by observing theeffect of two progesterone concentrations (60 and 120 mg) used in vaginal pessaries inpre-synchronization. The experiment was conducted in April/May and October/Novemberusing 40 healthy multiparous dairy ewes predominantly of the Lacaune breed, whichunderwent daily transrectal ultrasound examinations. The number of ovulations (1.35 vs1.05), ovulatory follicle diameter (mm) (5.97 vs 5.05), length of the luteal phase (11 vs 9.14days), and length of the estrous cycle (16.83 vs 16.6 days) were assessed within and out ofthe breeding season, respectively. The sheep out of the breeding season did not present acorpus luteum at the time of insertion of the vaginal pessary, characterizing anestrus. Theovulatory follicle had a larger diameter in the breeding season even with the shorter lengthof the follicular phase, suggesting higher viability and quality of the ovulated oocyte. Theapplication of exogenous progesterone extends the luteal phase in the breeding season(11 vs 9.14 days). The anestrus observed out of season suggests the need for a higherprogesterone concentration in reproductive protocols. Therefore, breeding protocols canbe adapted for different seasons, suggesting the use of vaginal pessaries with a higherprogesterone concentration (120 mg) out of the breeding season. The data allowed thecharacterization of follicular dynamics in dairy sheep, demonstrating their differences ineach season based on the use of different progesterone doses in pre-synchronization.
publishDate 2024
dc.date.none.fl_str_mv 2024-02-05
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://revistas.ufg.br/vet/article/view/77084
url https://revistas.ufg.br/vet/article/view/77084
dc.language.iso.fl_str_mv por
eng
language por
eng
dc.relation.none.fl_str_mv https://revistas.ufg.br/vet/article/view/77084/40779
https://revistas.ufg.br/vet/article/view/77084/40780
https://revistas.ufg.br/vet/article/view/77084/41019
https://revistas.ufg.br/vet/article/view/77084/41020
dc.rights.driver.fl_str_mv Copyright (c) 2024 Ciência Animal Brasileira / Brazilian Animal Science
http://creativecommons.org/licenses/by/4.0
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2024 Ciência Animal Brasileira / Brazilian Animal Science
http://creativecommons.org/licenses/by/4.0
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Universidade Federal de Goiás
publisher.none.fl_str_mv Universidade Federal de Goiás
dc.source.none.fl_str_mv Brazilian Animal Science/ Ciência Animal Brasileira; Vol. 25 (2024): Publicação continua
Ciência Animal Brasileira / Brazilian Animal Science; v. 25 (2024): Publicação continua
1809-6891
1518-2797
reponame:Ciência animal brasileira (Online)
instname:Universidade Federal de Goiás (UFG)
instacron:UFG
instname_str Universidade Federal de Goiás (UFG)
instacron_str UFG
institution UFG
reponame_str Ciência animal brasileira (Online)
collection Ciência animal brasileira (Online)
repository.name.fl_str_mv Ciência animal brasileira (Online) - Universidade Federal de Goiás (UFG)
repository.mail.fl_str_mv ||revistacab@gmail.com
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