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Registro Completo |
Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
Data corrente: |
06/04/2005 |
Data da última atualização: |
06/04/2005 |
Autoria: |
EVANS, A. C. O.; DUFFY, P.; QUINN, K. M.; KNIGHT, P. G.; BOLAND, M. P. |
Título: |
Follicular waves are associated with transient fluctuations in FSH but not oestradiol or inhibin-A concentrations in anoestrous ewes. |
Ano de publicação: |
2001 |
Fonte/Imprenta: |
Animal Science, v. 72, pt 3, p. 547-554, 2001. |
Idioma: |
Inglês |
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 |
Palavras-Chave: |
Folículo; FSH; Inibidor. |
Thesagro: |
Endocrinologia; Estradiol; Estrógeno; Hormônio; Ovino; Reprodução Animal. |
Categoria do assunto: |
-- |
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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| Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
04/02/1998 |
Data da última atualização: |
14/05/2009 |
Autoria: |
VASCONCELOS, M. A. B.; OLIVEIRA, E. R. de; FERNANDES, F. D.; BARROS, N. N. |
Título: |
Avaliacao da dieta de ovinos em pastejo no semi-arido do estado do Ceara. |
Ano de publicação: |
1996 |
Fonte/Imprenta: |
In: REUNIAO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 33, 1996, Fortaleza, CE. Anais. Fortaleza: SBZ, 1996. |
Volume: |
v.3. |
Páginas: |
p.217-218. |
Idioma: |
Português |
Palavras-Chave: |
Brasil; Ceara. |
Thesagro: |
Caatinga; Composição Química; Dieta; Ovelha; Ovino. |
Thesaurus NAL: |
Brazil; chemical composition; diet; ewes. |
Categoria do assunto: |
-- |
Marc: |
LEADER 00825naa a2200301 a 4500 001 1557825 005 2009-05-14 008 1996 bl --- 0-- u #d 100 1 $aVASCONCELOS, M. A. B. 245 $aAvaliacao da dieta de ovinos em pastejo no semi-arido do estado do Ceara. 260 $c1996 300 $ap.217-218. v.3. 490 $vv.3. 650 $aBrazil 650 $achemical composition 650 $adiet 650 $aewes 650 $aCaatinga 650 $aComposição Química 650 $aDieta 650 $aOvelha 650 $aOvino 653 $aBrasil 653 $aCeara 700 1 $aOLIVEIRA, E. R. de 700 1 $aFERNANDES, F. D. 700 1 $aBARROS, N. N. 773 $tIn: REUNIAO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 33, 1996, Fortaleza, CE. Anais. Fortaleza: SBZ, 1996.
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