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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
06/04/2005 |
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Data da última atualização: |
06/04/2005 |
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Autoria: |
EVANS, A. C. O.; DUFFY, P.; QUINN, K. M.; KNIGHT, P. G.; BOLAND, M. P. |
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Título: |
Follicular waves are associated with transient fluctuations in FSH but not oestradiol or inhibin-A concentrations in anoestrous ewes. |
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Ano de publicação: |
2001 |
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Fonte/Imprenta: |
Animal Science, v. 72, pt 3, p. 547-554, 2001. |
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Idioma: |
Inglês |
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Conteúdo: |
The aim roas to examine statistically the changes among days in the numbers of follicles relative to the growth of large follicles to test the hypothesis that follicular development occurs in a wave-like fashion in anoestrous ewes. The relationships among the patterns of circulating concentrations of FSH, oestradiol and inhibin-A and the pattern of follicular growth as well as relationships among follicular fluid steroid and inhibin-A concentrations were also studied. The avaries of 11 ewes were examined daily using transrectal ultrasonography for 14 days and blood samples were collected every 8 h for 9 days. Five ewes were ovariectomized on the last day of ultrasound scanning. One to three identified follicles (a cohort) emerged every 2 to 5 days (mean 2.9 (s.e.0.2) days) in individual ewes. The numbers of 4 and 5 mm follicles were fewest (P < 0.05) before and greatest (P < 0.05) 1 day after cohort emergence. This change in the numbers of follicles indicates a wave-like pattern of follícular growth. FSH concentrations were greatest (P < 0.05) on the day before wave emergence and lowest (P < 0.05) on the day of wave emergence. Peripheral concentrations of oestradiol and inhibin-A did not fluctuate (P > 0.05) in association with the emergence of follicular waves. The foIlicles that were collected at ovariectomy originated from one of three different waves. Oestradiol and inhibin-A concentrations in foIlicular fluid and the oestradiol-to-progesterone ratio were not different among the largest foIlicles of successive waves, when foIlicles were collected at the same time, indicating thàt new waves of foIlicles developed before the demise of old waves. In conclusion, waves of foIlicles emerged about every 3 days in anoestrous ewes (defined as significant changes in numbers of follicles) and roere associated with fluctuations in FSH concentrations but not peripheral oestradiol or inhibin-A concentrations. New foIlicular waves also emerged in the presence of steroidogenically active (positive oestradiol-to-progesterone ratio), inhibin-A producing foIlicles from a previous wave suggesting that foIlicles do not exert functional dominance during the non-breeding season. MenosThe aim roas to examine statistically the changes among days in the numbers of follicles relative to the growth of large follicles to test the hypothesis that follicular development occurs in a wave-like fashion in anoestrous ewes. The relationships among the patterns of circulating concentrations of FSH, oestradiol and inhibin-A and the pattern of follicular growth as well as relationships among follicular fluid steroid and inhibin-A concentrations were also studied. The avaries of 11 ewes were examined daily using transrectal ultrasonography for 14 days and blood samples were collected every 8 h for 9 days. Five ewes were ovariectomized on the last day of ultrasound scanning. One to three identified follicles (a cohort) emerged every 2 to 5 days (mean 2.9 (s.e.0.2) days) in individual ewes. The numbers of 4 and 5 mm follicles were fewest (P < 0.05) before and greatest (P < 0.05) 1 day after cohort emergence. This change in the numbers of follicles indicates a wave-like pattern of follícular growth. FSH concentrations were greatest (P < 0.05) on the day before wave emergence and lowest (P < 0.05) on the day of wave emergence. Peripheral concentrations of oestradiol and inhibin-A did not fluctuate (P > 0.05) in association with the emergence of follicular waves. The foIlicles that were collected at ovariectomy originated from one of three different waves. Oestradiol and inhibin-A concentrations in foIlicular fluid and the oestradiol-to-progesterone ratio were not different a... Mostrar Tudo |
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Palavras-Chave: |
Folículo; FSH; Inibidor. |
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Thesagro: |
Endocrinologia; Estradiol; Estrógeno; Hormônio; Ovino; Reprodução Animal. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02969naa a2200277 a 4500
001 1531077
005 2005-04-06
008 2001 bl uuuu u00u1 u #d
100 1 $aEVANS, A. C. O.
245 $aFollicular waves are associated with transient fluctuations in FSH but not oestradiol or inhibin-A concentrations in anoestrous ewes.
260 $c2001
520 $aThe aim roas to examine statistically the changes among days in the numbers of follicles relative to the growth of large follicles to test the hypothesis that follicular development occurs in a wave-like fashion in anoestrous ewes. The relationships among the patterns of circulating concentrations of FSH, oestradiol and inhibin-A and the pattern of follicular growth as well as relationships among follicular fluid steroid and inhibin-A concentrations were also studied. The avaries of 11 ewes were examined daily using transrectal ultrasonography for 14 days and blood samples were collected every 8 h for 9 days. Five ewes were ovariectomized on the last day of ultrasound scanning. One to three identified follicles (a cohort) emerged every 2 to 5 days (mean 2.9 (s.e.0.2) days) in individual ewes. The numbers of 4 and 5 mm follicles were fewest (P < 0.05) before and greatest (P < 0.05) 1 day after cohort emergence. This change in the numbers of follicles indicates a wave-like pattern of follícular growth. FSH concentrations were greatest (P < 0.05) on the day before wave emergence and lowest (P < 0.05) on the day of wave emergence. Peripheral concentrations of oestradiol and inhibin-A did not fluctuate (P > 0.05) in association with the emergence of follicular waves. The foIlicles that were collected at ovariectomy originated from one of three different waves. Oestradiol and inhibin-A concentrations in foIlicular fluid and the oestradiol-to-progesterone ratio were not different among the largest foIlicles of successive waves, when foIlicles were collected at the same time, indicating thàt new waves of foIlicles developed before the demise of old waves. In conclusion, waves of foIlicles emerged about every 3 days in anoestrous ewes (defined as significant changes in numbers of follicles) and roere associated with fluctuations in FSH concentrations but not peripheral oestradiol or inhibin-A concentrations. New foIlicular waves also emerged in the presence of steroidogenically active (positive oestradiol-to-progesterone ratio), inhibin-A producing foIlicles from a previous wave suggesting that foIlicles do not exert functional dominance during the non-breeding season.
650 $aEndocrinologia
650 $aEstradiol
650 $aEstrógeno
650 $aHormônio
650 $aOvino
650 $aReprodução Animal
653 $aFolículo
653 $aFSH
653 $aInibidor
700 1 $aDUFFY, P.
700 1 $aQUINN, K. M.
700 1 $aKNIGHT, P. G.
700 1 $aBOLAND, M. P.
773 $tAnimal Science$gv. 72, pt 3, p. 547-554, 2001.
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Embrapa Caprinos e Ovinos (CNPC) |
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| 3. |  | ANDRADE, C. A. de; TRETTEL, M.; GERDES, L; BARBOSA, C. M. P; RODRIGUES, P. H. M.; LIGO, M. A. V.; NOGUEIRA, S. F.; LIMA, M. A. de; CARVALHO, T. A.; BETTANIN, V. C.; SANTOS, J. de O.; VASO, L. M. Emission of greenhouse gases from soils under pastures submitted to diferent grazing managements and nitrogen fertilization rates, and intercropping with macrotyloma. In: SYMPOSIUM STRATEGIC PRACTICES FOR MITIGATING GREENHOUSE GAS EMISSION IN GRASSLAND. Proceedings... São Carlos: Embrapa Pecuária Sudeste, 2023. p. 28-30. p. 28-30| Tipo: Artigo em Anais de Congresso |
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| 11. | | FASIABEN, M. do C. R.; ALMEIDA, M. M. T. B.; MAIA, A. G.; OLIVEIRA, O. C. de; COSTA, F. P.; BARIONI, L. G.; DIAS, F. R. T.; MOREIRA, J. M. M. A. P.; SENA, A. L. dos S.; SANTOS, J. C. dos; LAMPERT, V. do N.; OLIVEIRA, P. P. A.; ABREU, U. G. P. de; GREGO, C. R. Technological profile of beef cattle farms in Brazilian biomes. Campinas: Embrapa Informática Agropecuária, 2020. 54 p. il. (Embrapa Informática Agropecuária. Boletim de pesquisa e desenvolvimento, 48).| Tipo: Boletim de Pesquisa e Desenvolvimento |
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| 14. | | SILVA, J. M. L. da; VALENTE, M. A.; RODRIGUES, T. E.; PONTE, F. C. da. Zoneamento agroecológico do Município de Abel Figueiredo, Estado do Pará. Belém, PA: Embrapa Amazônia Oriental, 2002. 34 p. (Embrapa Amazônia Oriental. Documentos, 139). Anexo 4 mapas: Mapa de potencialidade à mecanização das terras do Município de Abel Figueiredo, Estado do Pará; Mapa de suscetibilidade à erosão do Município de Abel Figueiredo, Estado do Pará; Mapa de zoneamento agroecológico das terras...| Biblioteca(s): Embrapa Amazônia Oriental. |
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