OVARIAN STEROIDS SECRETION, IN BEEF CROSSBREED EWES, AT DISTINCT MOMENTS OF YEAR, IN SÃO PAULO STATE
Autor(a) principal: | |
---|---|
Data de Publicação: | 2008 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Ciência animal brasileira (Online) |
Texto Completo: | https://revistas.ufg.br/vet/article/view/1461 |
Resumo: | To define possible seasonality reprodutive in ovarian steroidogenesis at latitude 22°53’S and longitude 46°29’W, evaluated oestradiol (E2) and progesterone (P4) plasma concentrations, during the estrus cycle, at seasons considerate reproductive and non breeding, adult ewes were induced and/or synchronized with progesterone intra-vaginal dispenser (CIDR®/13 days) and 500 IU of eCG (IM) injected upon device removal, at two periods throughout the year (experiment 1 – non breeding season, September and October; experiment 3 – breeding season, February and March), and natural estrus (experiment 2 – breeding season, January). In all experiments, blood samples were collected daily, in the morning, via jugular vein puncture during the estrous cycle to determine ovarian steroids plasma concentrations. The mean E2 (20.05 ± 11.12 pg/mL) and P4 (3.58 ± 2.38 ng/mL) concentrations evidenced differences between days of estrous cycle (p<0.0001), experiments (p<0.0001) and animals (p<0.0001). The mean oestradiol plasma levels have higher concentrations during synchronized estrus on September and October (non breeding season) than at the breeding season (February and March) or during the natural estrus period (January). These patterns of hormone concentrations revealed that follicular growth and development remained constant, compatible with ovulation, throughout reproductive cycle on different periods during either the synchronized or natural estrus. The mean progesterone plasma concentrations were higher during synchronized estrus at the breeding season, followed by the non breeding season, and lower during natural estrus period. In conclusion, normal steroidogenic function, follicular and luteal, was observed throughout the year, which revealed an ausence of seasonal influence within the related latitude, without anestrous season.KEY WORDS: Oestradiol, progesterone, reproductive seasonality, sheep. |
id |
UFG-7_58333e43c72f8cd3bf665a75154b397f |
---|---|
oai_identifier_str |
oai:ojs.revistas.ufg.br:article/1461 |
network_acronym_str |
UFG-7 |
network_name_str |
Ciência animal brasileira (Online) |
repository_id_str |
|
spelling |
OVARIAN STEROIDS SECRETION, IN BEEF CROSSBREED EWES, AT DISTINCT MOMENTS OF YEAR, IN SÃO PAULO STATESECREÇÃO DE ESTERÓIDES OVARIANOS, EM OVELHAS MESTIÇAS DE RAÇAS EXPLORADAS PARA CORTE, EM DISTINTOS MOMENTOS REPRODUTIVOS, NO ESTADO DE SÃO PAULOSaidade AnimalTo define possible seasonality reprodutive in ovarian steroidogenesis at latitude 22°53’S and longitude 46°29’W, evaluated oestradiol (E2) and progesterone (P4) plasma concentrations, during the estrus cycle, at seasons considerate reproductive and non breeding, adult ewes were induced and/or synchronized with progesterone intra-vaginal dispenser (CIDR®/13 days) and 500 IU of eCG (IM) injected upon device removal, at two periods throughout the year (experiment 1 – non breeding season, September and October; experiment 3 – breeding season, February and March), and natural estrus (experiment 2 – breeding season, January). In all experiments, blood samples were collected daily, in the morning, via jugular vein puncture during the estrous cycle to determine ovarian steroids plasma concentrations. The mean E2 (20.05 ± 11.12 pg/mL) and P4 (3.58 ± 2.38 ng/mL) concentrations evidenced differences between days of estrous cycle (p<0.0001), experiments (p<0.0001) and animals (p<0.0001). The mean oestradiol plasma levels have higher concentrations during synchronized estrus on September and October (non breeding season) than at the breeding season (February and March) or during the natural estrus period (January). These patterns of hormone concentrations revealed that follicular growth and development remained constant, compatible with ovulation, throughout reproductive cycle on different periods during either the synchronized or natural estrus. The mean progesterone plasma concentrations were higher during synchronized estrus at the breeding season, followed by the non breeding season, and lower during natural estrus period. In conclusion, normal steroidogenic function, follicular and luteal, was observed throughout the year, which revealed an ausence of seasonal influence within the related latitude, without anestrous season.KEY WORDS: Oestradiol, progesterone, reproductive seasonality, sheep.Para definir existência ou não, na latitude 22°53’S e longitude 46°29’W, de estacionalidade reprodutiva sobre a esteroidogênese ovariana, avaliaram-se as concentrações plasmáticas de estradiol (E2) e progesterona (P4), no ciclo estral, nas estações consideradas reprodutiva e não-reprodutiva. Ovelhas adultas tiveram o estro induzido e/ou sincronizado, com dispositivo de progesterona intravaginal (CIDR®/13 dias) e injeção de 500 UI de eCG (IM), no momento da retirada do dispositivo, em dois momentos do ano: Experimento 1 – estação não-reprodutiva, setembro e outubro; Experimento 3 – estação reprodutiva, fevereiro e março, mais um estro natural; Experimento 2 – estação reprodutiva, janeiro. Em todos os experimentos colheu-se sangue, por venopunção jugular, diariamente, pela manhã, em todo ciclo estral, para determinação dos esteróides ovarianos. Os níveis médios de E2 (20,05 ± 11,12 pg/mL) e de P4 (3,58 ± 2,38 ng/mL) evidenciaram diferenças significativas entre dias do ciclo estral (p<0,0001), experimentos (p<0,0001) e animais (p<0,0001). As concentrações plasmáticas de E2 apresentaram-se mais elevadas no estro sincronizado durante a estação não-reprodutiva, em relação aos valores do estro sincronizado na estação reprodutiva e do estro natural, demonstrando crescimento e desenvolvimento foliculares contínuos, compatíveis com ovulação, durante o ciclo reprodutivo, nos diferentes momentos do ano. Já os níveis plasmáticos de P4 foram maiores na estação reprodutiva, seguidos daqueles da estação não-reprodutiva e menores no estro natural. Os resultados indicam função esteroidogênica normal, folicular e lúeta, ao longo do ano, sem influência estacional, nesta latitude, comprovando a ausência de uma estação de anestro e permitindo o manejo reprodutivo das fêmeas no ano todo.PALAVRAS-CHAVES: Estacionalidade reprodutiva, estradiol, ovinos, progesterona.Universidade Federal de Goiás2008-12-21info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionAvaliado por parespesquisaapplication/pdfhttps://revistas.ufg.br/vet/article/view/146110.5216/cab.v9i4.1461Brazilian Animal Science/ Ciência Animal Brasileira; Vol. 9 No. 4 (2008); 1107-1113Ciência Animal Brasileira / Brazilian Animal Science; v. 9 n. 4 (2008); 1107-11131809-68911518-2797reponame:Ciência animal brasileira (Online)instname:Universidade Federal de Goiás (UFG)instacron:UFGporhttps://revistas.ufg.br/vet/article/view/1461/4374Souza, Maria Inês LenzUribe-Velásquez, Luis FernandoOba, EuniceSá Filho, Ocilon Gomes deRamos, Alcides de Amoriminfo:eu-repo/semantics/openAccess2008-12-21T21:10:30Zoai:ojs.revistas.ufg.br:article/1461Revistahttps://revistas.ufg.br/vetPUBhttps://revistas.ufg.br/vet/oai||revistacab@gmail.com1809-68911518-2797opendoar:2024-05-21T19:54:55.592552Ciência animal brasileira (Online) - Universidade Federal de Goiás (UFG)true |
dc.title.none.fl_str_mv |
OVARIAN STEROIDS SECRETION, IN BEEF CROSSBREED EWES, AT DISTINCT MOMENTS OF YEAR, IN SÃO PAULO STATE SECREÇÃO DE ESTERÓIDES OVARIANOS, EM OVELHAS MESTIÇAS DE RAÇAS EXPLORADAS PARA CORTE, EM DISTINTOS MOMENTOS REPRODUTIVOS, NO ESTADO DE SÃO PAULO |
title |
OVARIAN STEROIDS SECRETION, IN BEEF CROSSBREED EWES, AT DISTINCT MOMENTS OF YEAR, IN SÃO PAULO STATE |
spellingShingle |
OVARIAN STEROIDS SECRETION, IN BEEF CROSSBREED EWES, AT DISTINCT MOMENTS OF YEAR, IN SÃO PAULO STATE Souza, Maria Inês Lenz Saidade Animal |
title_short |
OVARIAN STEROIDS SECRETION, IN BEEF CROSSBREED EWES, AT DISTINCT MOMENTS OF YEAR, IN SÃO PAULO STATE |
title_full |
OVARIAN STEROIDS SECRETION, IN BEEF CROSSBREED EWES, AT DISTINCT MOMENTS OF YEAR, IN SÃO PAULO STATE |
title_fullStr |
OVARIAN STEROIDS SECRETION, IN BEEF CROSSBREED EWES, AT DISTINCT MOMENTS OF YEAR, IN SÃO PAULO STATE |
title_full_unstemmed |
OVARIAN STEROIDS SECRETION, IN BEEF CROSSBREED EWES, AT DISTINCT MOMENTS OF YEAR, IN SÃO PAULO STATE |
title_sort |
OVARIAN STEROIDS SECRETION, IN BEEF CROSSBREED EWES, AT DISTINCT MOMENTS OF YEAR, IN SÃO PAULO STATE |
author |
Souza, Maria Inês Lenz |
author_facet |
Souza, Maria Inês Lenz Uribe-Velásquez, Luis Fernando Oba, Eunice Sá Filho, Ocilon Gomes de Ramos, Alcides de Amorim |
author_role |
author |
author2 |
Uribe-Velásquez, Luis Fernando Oba, Eunice Sá Filho, Ocilon Gomes de Ramos, Alcides de Amorim |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Souza, Maria Inês Lenz Uribe-Velásquez, Luis Fernando Oba, Eunice Sá Filho, Ocilon Gomes de Ramos, Alcides de Amorim |
dc.subject.por.fl_str_mv |
Saidade Animal |
topic |
Saidade Animal |
description |
To define possible seasonality reprodutive in ovarian steroidogenesis at latitude 22°53’S and longitude 46°29’W, evaluated oestradiol (E2) and progesterone (P4) plasma concentrations, during the estrus cycle, at seasons considerate reproductive and non breeding, adult ewes were induced and/or synchronized with progesterone intra-vaginal dispenser (CIDR®/13 days) and 500 IU of eCG (IM) injected upon device removal, at two periods throughout the year (experiment 1 – non breeding season, September and October; experiment 3 – breeding season, February and March), and natural estrus (experiment 2 – breeding season, January). In all experiments, blood samples were collected daily, in the morning, via jugular vein puncture during the estrous cycle to determine ovarian steroids plasma concentrations. The mean E2 (20.05 ± 11.12 pg/mL) and P4 (3.58 ± 2.38 ng/mL) concentrations evidenced differences between days of estrous cycle (p<0.0001), experiments (p<0.0001) and animals (p<0.0001). The mean oestradiol plasma levels have higher concentrations during synchronized estrus on September and October (non breeding season) than at the breeding season (February and March) or during the natural estrus period (January). These patterns of hormone concentrations revealed that follicular growth and development remained constant, compatible with ovulation, throughout reproductive cycle on different periods during either the synchronized or natural estrus. The mean progesterone plasma concentrations were higher during synchronized estrus at the breeding season, followed by the non breeding season, and lower during natural estrus period. In conclusion, normal steroidogenic function, follicular and luteal, was observed throughout the year, which revealed an ausence of seasonal influence within the related latitude, without anestrous season.KEY WORDS: Oestradiol, progesterone, reproductive seasonality, sheep. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-12-21 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Avaliado por pares pesquisa |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://revistas.ufg.br/vet/article/view/1461 10.5216/cab.v9i4.1461 |
url |
https://revistas.ufg.br/vet/article/view/1461 |
identifier_str_mv |
10.5216/cab.v9i4.1461 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://revistas.ufg.br/vet/article/view/1461/4374 |
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 |
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. 9 No. 4 (2008); 1107-1113 Ciência Animal Brasileira / Brazilian Animal Science; v. 9 n. 4 (2008); 1107-1113 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 |
_version_ |
1799874783434768384 |