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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 Meio Ambiente. |
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Data corrente: |
20/03/2014 |
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Data da última atualização: |
30/09/2020 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
GONÇALVES, V. T.; SAMPAIO, F. G.; THOMAZ, J. M.; SANTANA, F. S.; CARRA, M. L. |
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Afiliação: |
FERNANDA GARCIA SAMPAIO, CNPMA. |
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Título: |
Uso dos parâmetros hematológicos da tilápia do Nilo (Oreochromis niloticus), cultivadas em tanques rede no Reservatório de Furnas/MG, como ferramenta no biomonitoramento. |
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Ano de publicação: |
2013 |
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Fonte/Imprenta: |
In: CONGRESSO NACIONAL DE INICIAÇÃO CIENTÍFICA, 13., 2013, Campinas. Anais... Campinas: Sindicato das Entidades Mantenedoras de Ensino Superior (Semesp), 2013. |
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Páginas: |
10 p. |
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Idioma: |
Português |
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Conteúdo: |
O presente trabalho teve por objetivo analisar variáveis ambientais e fisiológicas de exemplares de tilápia do Nilo (Oreochromis niloticus) provenientes de três propriedades de pisciculturas em tanques rede, no reservatório de Furnas, município de Guapé (MG). Foram utilizados 10 espécimes, aparentemente sadios e alimentados com ração comercial, de cada propriedade para realização das análises hematológicas e zootécnicas. Foram avaliados: a) os índices zootécnicos (peso vivo, comprimento total, comprimento parcial, peso das vísceras, peso do fígado, Índice Hepatossomático e Índice Viscerossomático); b) eritrograma (contagem de eritrócitos-Eri, concentração de hemoglobina-Hb, e percentagem de hematócrito-Hct); c) os índices hematimétricos (Volume Corpuscular Médio e Concentração de Hemoglobina Corpuscular Média), e d) leucograma (contagem total e diferencial de leucócitos). Os resultados foram comparados com base na qualidade da água a que os animais estavam expostos no momento da coleta. |
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Palavras-Chave: |
Biomonitoramento. |
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Thesagro: |
Hematologia; Tilápia nilótica. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/216318/1/2013SP-Sampaio-Uso-13074.pdf
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Marc: |
LEADER 01842nam a2200205 a 4500
001 1983007
005 2020-09-30
008 2013 bl uuuu u00u1 u #d
100 1 $aGONÇALVES, V. T.
245 $aUso dos parâmetros hematológicos da tilápia do Nilo (Oreochromis niloticus), cultivadas em tanques rede no Reservatório de Furnas/MG, como ferramenta no biomonitoramento.$h[electronic resource]
260 $aIn: CONGRESSO NACIONAL DE INICIAÇÃO CIENTÍFICA, 13., 2013, Campinas. Anais... Campinas: Sindicato das Entidades Mantenedoras de Ensino Superior (Semesp)$c2013
300 $a 10 p.
520 $aO presente trabalho teve por objetivo analisar variáveis ambientais e fisiológicas de exemplares de tilápia do Nilo (Oreochromis niloticus) provenientes de três propriedades de pisciculturas em tanques rede, no reservatório de Furnas, município de Guapé (MG). Foram utilizados 10 espécimes, aparentemente sadios e alimentados com ração comercial, de cada propriedade para realização das análises hematológicas e zootécnicas. Foram avaliados: a) os índices zootécnicos (peso vivo, comprimento total, comprimento parcial, peso das vísceras, peso do fígado, Índice Hepatossomático e Índice Viscerossomático); b) eritrograma (contagem de eritrócitos-Eri, concentração de hemoglobina-Hb, e percentagem de hematócrito-Hct); c) os índices hematimétricos (Volume Corpuscular Médio e Concentração de Hemoglobina Corpuscular Média), e d) leucograma (contagem total e diferencial de leucócitos). Os resultados foram comparados com base na qualidade da água a que os animais estavam expostos no momento da coleta.
650 $aHematologia
650 $aTilápia nilótica
653 $aBiomonitoramento
700 1 $aSAMPAIO, F. G.
700 1 $aTHOMAZ, J. M.
700 1 $aSANTANA, F. S.
700 1 $aCARRA, M. L.
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