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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
25/09/2000 |
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Data da última atualização: |
11/08/2023 |
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Autoria: |
ADAMS, G. P. |
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Título: |
Comparative patterns of follicle development and selection in ruminants. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
Journal Reproduction and Fertility, v. 54, suppl. p. 17-32, 1999. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Expanding technological capabilities, particularly in ultrasonography and molecular endocrinology, have bridged the gap between form and function of the ovary, and have been a catalyst for intense research activity in this area during the last decade. However, the study of follicular dynamics is still in its infancy in ruminant species other than cattle, and controversy persists regarding the pattern of follicular growth and the existence of follicular dominance. The bovine model of ovarian function is presented as a foundation for concepts surrounding the control of follicular development in ruminants, and to place in context the results of recent studies in sheep, goats, muskoxen, cervids and camelids. This comparative approach is used to determine important generalities that appear to be applicable, as fundamental physiological phenomena, to all ruminant species. Although clear differences in follicular dynamics are evident, differences appear to be specific rather than general, and the following conclusions are consistent with results reported in ruminant species to date: (1) follicles grow in a wave-like fashion; (2) periodic surges in circulating FSH are associated with follicular wave emergence; (3) selection of a dominant follicle involves a decline in FSH and acquisition of LH responsiveness; (4) periodic anovulatory follicular waves continue to emerge until occurrence of an LH surge (that is, at the time of luteolysis during the ovulatory season or during transition from the anovulatory season); (5) within species, there is a positive relationship between the duration of the oestrous cycle and the number of follicular waves; (6) progesterone suppresses LH secretion and growth of the dominant follicle; (7) the duration of the interwave interval is a function of follicular dominance, and is negatively correlated with circulating FSH; (8) follicular dominance in all species is more pronounced during the first and last follicular waves of the oestrous cycle; and (9) pregnancy, the prepubertal period and seasonal anoestrus are characterized by regular, periodic surges in FSH and emergence of anovulatory follicular waves. MenosAbstract: Expanding technological capabilities, particularly in ultrasonography and molecular endocrinology, have bridged the gap between form and function of the ovary, and have been a catalyst for intense research activity in this area during the last decade. However, the study of follicular dynamics is still in its infancy in ruminant species other than cattle, and controversy persists regarding the pattern of follicular growth and the existence of follicular dominance. The bovine model of ovarian function is presented as a foundation for concepts surrounding the control of follicular development in ruminants, and to place in context the results of recent studies in sheep, goats, muskoxen, cervids and camelids. This comparative approach is used to determine important generalities that appear to be applicable, as fundamental physiological phenomena, to all ruminant species. Although clear differences in follicular dynamics are evident, differences appear to be specific rather than general, and the following conclusions are consistent with results reported in ruminant species to date: (1) follicles grow in a wave-like fashion; (2) periodic surges in circulating FSH are associated with follicular wave emergence; (3) selection of a dominant follicle involves a decline in FSH and acquisition of LH responsiveness; (4) periodic anovulatory follicular waves continue to emerge until occurrence of an LH surge (that is, at the time of luteolysis during the ovulatory season or during... Mostrar Tudo |
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Palavras-Chave: |
Crescimento folicular; FSH; Onda folicular. |
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Thesagro: |
Endocrinologia; Ruminante. |
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Thesaurus Nal: |
Cattle; Estrous cycle; Follicular development; Goats; Pregnancy; Reproduction; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02893naa a2200265 a 4500
001 1524151
005 2023-08-11
008 1999 bl uuuu u00u1 u #d
100 1 $aADAMS, G. P.
245 $aComparative patterns of follicle development and selection in ruminants.$h[electronic resource]
260 $c1999
520 $aAbstract: Expanding technological capabilities, particularly in ultrasonography and molecular endocrinology, have bridged the gap between form and function of the ovary, and have been a catalyst for intense research activity in this area during the last decade. However, the study of follicular dynamics is still in its infancy in ruminant species other than cattle, and controversy persists regarding the pattern of follicular growth and the existence of follicular dominance. The bovine model of ovarian function is presented as a foundation for concepts surrounding the control of follicular development in ruminants, and to place in context the results of recent studies in sheep, goats, muskoxen, cervids and camelids. This comparative approach is used to determine important generalities that appear to be applicable, as fundamental physiological phenomena, to all ruminant species. Although clear differences in follicular dynamics are evident, differences appear to be specific rather than general, and the following conclusions are consistent with results reported in ruminant species to date: (1) follicles grow in a wave-like fashion; (2) periodic surges in circulating FSH are associated with follicular wave emergence; (3) selection of a dominant follicle involves a decline in FSH and acquisition of LH responsiveness; (4) periodic anovulatory follicular waves continue to emerge until occurrence of an LH surge (that is, at the time of luteolysis during the ovulatory season or during transition from the anovulatory season); (5) within species, there is a positive relationship between the duration of the oestrous cycle and the number of follicular waves; (6) progesterone suppresses LH secretion and growth of the dominant follicle; (7) the duration of the interwave interval is a function of follicular dominance, and is negatively correlated with circulating FSH; (8) follicular dominance in all species is more pronounced during the first and last follicular waves of the oestrous cycle; and (9) pregnancy, the prepubertal period and seasonal anoestrus are characterized by regular, periodic surges in FSH and emergence of anovulatory follicular waves.
650 $aCattle
650 $aEstrous cycle
650 $aFollicular development
650 $aGoats
650 $aPregnancy
650 $aReproduction
650 $aSheep
650 $aEndocrinologia
650 $aRuminante
653 $aCrescimento folicular
653 $aFSH
653 $aOnda folicular
773 $tJournal Reproduction and Fertility$gv. 54, suppl. p. 17-32, 1999.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Recursos Genéticos e Biotecnologia. |
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Data corrente: |
29/09/2009 |
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Data da última atualização: |
29/09/2009 |
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Tipo da produção científica: |
Folder/Folheto/Cartilha |
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Autoria: |
EMBRAPA RECURSOS GENÉTICOS E BIOTECNOLOGIA. |
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Título: |
Coleções de culturas de microrganismos multifuncionais. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Brasília, DF, 2009. |
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Descrição Física: |
1 folder. |
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Idioma: |
Português |
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Notas: |
Bilingüe (português e inglês). |
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Conteúdo: |
São coleções de microrganismos que têm múltiplas funções biológicas e ecológicas e que tem potencial biotecnológico de aplicação na agricultura, promovendo aumentos de produtividade, redução da dependência de agroquímicos e recuperação ambiental. |
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Palavras-Chave: |
Microrganismos. |
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Thesagro: |
Bactéria; Conservação; Fungo; Microrganismo; Solo. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00810nam a2200205 a 4500
001 1512535
005 2009-09-29
008 2009 bl uuuu u0uu1 u #d
100 1 $aEMBRAPA RECURSOS GENÉTICOS E BIOTECNOLOGIA.
245 $aColeções de culturas de microrganismos multifuncionais.
260 $aBrasília, DF$c2009
300 $c1 folder.
500 $aBilingüe (português e inglês).
520 $aSão coleções de microrganismos que têm múltiplas funções biológicas e ecológicas e que tem potencial biotecnológico de aplicação na agricultura, promovendo aumentos de produtividade, redução da dependência de agroquímicos e recuperação ambiental.
650 $aBactéria
650 $aConservação
650 $aFungo
650 $aMicrorganismo
650 $aSolo
653 $aMicrorganismos
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Embrapa Recursos Genéticos e Biotecnologia (CENARGEN) |
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