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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
10/01/2025 |
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Data da última atualização: |
10/01/2025 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
OLIVEIRA, M. E. F.; AYRES, H.; OLIVEIRA, L. G.; OBA, E.; KRIDLI, R. T.; BARTLEWSKI, P. M.; FONSECA, J. F. da; BICUDO, S. D.; VICENTE, W. R. R. |
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Afiliação: |
SÃO PAULO STATE UNIVERSITY; UNIVERSITY OF SÃO PAULO; SÃO PAULO STATE UNIVERSITY; SÃO PAULO STATE UNIVERSITY; UNIVERSITY OF GUELPH; UNIVERSITY OF GUELPH; JEFERSON FERREIRA DA FONSECA, CNPC; SÃO PAULO STATE UNIVERSITY; SÃO PAULO STATE UNIVERSITY. |
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Título: |
Follicular wave emergence in Santa Inês ewes subjected to long-term, progesterone-based estrous synchronization protocols at different times of the year. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
Animal Reproduction Science, v. 174, p. 80-86, Nov. 2016. |
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DOI: |
10.1016/j.anireprosci.2016.09.008 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: This study was conducted to document the pattern of antral follicular wave emergence throughout the 14-day, progesterone (P4)-based estrous synchronization protocol in ewes that were maintained in subtropical conditions, during the period of increasing day lengths (ID), decreasing day lengths (DD), and the transitional period (TP). In addition, the influence of ovarian status (i.e., size of ovarian antral follicles and the presence of corpora lutea) at the outset of P4 treatment on ensuing ovarian follicular wave development was examined. Sexually mature Santa Inês ewes (n = 70) were subjected to one of the two estrous synchronization protocols in the three seasons. On Day 0, the ewes received an i.m. injection of prostaglandin F2α and an intravaginal P4-releasing device that remained in place for 14 days (G-1CIDR) or was replaced on Day 7 (G-2CIDR). Daily ultrasonography of ovaries was conducted from Days 0 to 15. Mean (±SEM) numbers of follicular waves per ewe were 3.7 ± 0.1 and 3.6 ± 0.1 for G-1CIDR and G-2CIDR (P > 0.05). The number of emerging follicular waves was greater (P < 0.05) during the ID period than during the TP and DD periods (4.0 ± 0.1, 3.4 ± 0.1 and 3.6 ± 0.1, respectively). The presence of medium-sized antral follicles (4.0 to 5.75 mm) in the absence of corpora lutea at the time of CIDR insertion tended to advance follicular wave emergence. Although the long-term P4 treatment was not originally designed to synchronize follicular waves, there was a distinctive pattern of follicular wave dynamics during the period of application of CIDRs that was affected mainly by the number of emerging follicular waves and ovarian status at CIDR insertion. MenosAbstract: This study was conducted to document the pattern of antral follicular wave emergence throughout the 14-day, progesterone (P4)-based estrous synchronization protocol in ewes that were maintained in subtropical conditions, during the period of increasing day lengths (ID), decreasing day lengths (DD), and the transitional period (TP). In addition, the influence of ovarian status (i.e., size of ovarian antral follicles and the presence of corpora lutea) at the outset of P4 treatment on ensuing ovarian follicular wave development was examined. Sexually mature Santa Inês ewes (n = 70) were subjected to one of the two estrous synchronization protocols in the three seasons. On Day 0, the ewes received an i.m. injection of prostaglandin F2α and an intravaginal P4-releasing device that remained in place for 14 days (G-1CIDR) or was replaced on Day 7 (G-2CIDR). Daily ultrasonography of ovaries was conducted from Days 0 to 15. Mean (±SEM) numbers of follicular waves per ewe were 3.7 ± 0.1 and 3.6 ± 0.1 for G-1CIDR and G-2CIDR (P > 0.05). The number of emerging follicular waves was greater (P < 0.05) during the ID period than during the TP and DD periods (4.0 ± 0.1, 3.4 ± 0.1 and 3.6 ± 0.1, respectively). The presence of medium-sized antral follicles (4.0 to 5.75 mm) in the absence of corpora lutea at the time of CIDR insertion tended to advance follicular wave emergence. Although the long-term P4 treatment was not originally designed to synchronize follicular waves, there was ... Mostrar Tudo |
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Palavras-Chave: |
Drug effects; Follicular dynamics; Ovarian follicle. |
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Thesagro: |
Ciclo Estral; Fotoperiodismo; Ovelha; Ovino; Progesterona; Reprodução; Sincronização do Cio; Superovulação. |
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Thesaurus Nal: |
Estrus synchronization; Females; Photoperiod; Physiology; Progesterone; Reproduction; Seasons; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 03024naa a2200457 a 4500
001 2171402
005 2025-01-10
008 2016 bl uuuu u00u1 u #d
024 7 $a10.1016/j.anireprosci.2016.09.008$2DOI
100 1 $aOLIVEIRA, M. E. F.
245 $aFollicular wave emergence in Santa Inês ewes subjected to long-term, progesterone-based estrous synchronization protocols at different times of the year.$h[electronic resource]
260 $c2016
520 $aAbstract: This study was conducted to document the pattern of antral follicular wave emergence throughout the 14-day, progesterone (P4)-based estrous synchronization protocol in ewes that were maintained in subtropical conditions, during the period of increasing day lengths (ID), decreasing day lengths (DD), and the transitional period (TP). In addition, the influence of ovarian status (i.e., size of ovarian antral follicles and the presence of corpora lutea) at the outset of P4 treatment on ensuing ovarian follicular wave development was examined. Sexually mature Santa Inês ewes (n = 70) were subjected to one of the two estrous synchronization protocols in the three seasons. On Day 0, the ewes received an i.m. injection of prostaglandin F2α and an intravaginal P4-releasing device that remained in place for 14 days (G-1CIDR) or was replaced on Day 7 (G-2CIDR). Daily ultrasonography of ovaries was conducted from Days 0 to 15. Mean (±SEM) numbers of follicular waves per ewe were 3.7 ± 0.1 and 3.6 ± 0.1 for G-1CIDR and G-2CIDR (P > 0.05). The number of emerging follicular waves was greater (P < 0.05) during the ID period than during the TP and DD periods (4.0 ± 0.1, 3.4 ± 0.1 and 3.6 ± 0.1, respectively). The presence of medium-sized antral follicles (4.0 to 5.75 mm) in the absence of corpora lutea at the time of CIDR insertion tended to advance follicular wave emergence. Although the long-term P4 treatment was not originally designed to synchronize follicular waves, there was a distinctive pattern of follicular wave dynamics during the period of application of CIDRs that was affected mainly by the number of emerging follicular waves and ovarian status at CIDR insertion.
650 $aEstrus synchronization
650 $aFemales
650 $aPhotoperiod
650 $aPhysiology
650 $aProgesterone
650 $aReproduction
650 $aSeasons
650 $aSheep
650 $aCiclo Estral
650 $aFotoperiodismo
650 $aOvelha
650 $aOvino
650 $aProgesterona
650 $aReprodução
650 $aSincronização do Cio
650 $aSuperovulação
653 $aDrug effects
653 $aFollicular dynamics
653 $aOvarian follicle
700 1 $aAYRES, H.
700 1 $aOLIVEIRA, L. G.
700 1 $aOBA, E.
700 1 $aKRIDLI, R. T.
700 1 $aBARTLEWSKI, P. M.
700 1 $aFONSECA, J. F. da
700 1 $aBICUDO, S. D.
700 1 $aVICENTE, W. R. R.
773 $tAnimal Reproduction Science$gv. 174, p. 80-86, Nov. 2016.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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