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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
31/03/2023 |
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Autoria: |
HENDERSON, K. M.; ELLEN, R. L.; SAVAGE, L. C.; BALL, K.; McNATTY, K. P. |
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Título: |
Effect on ovulation rate of increasing or decreasing ovarian exposure to follicle stimulating hormone during the preovulatory period in ewes. |
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Ano de publicação: |
1986 |
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Fonte/Imprenta: |
Proceedings of the New Zealand Society of Animal Production, v. 46, p. 157-159, 1986. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Ovine FSH was administered hourly to ewes for 48 h from the initiation of luteolysis. The mean ovulation rates of ewes receiving 2.5 µg FSH/h (2.1 ± 0.2 ovulations/ewe, mean ± s.e.m., n=8) and 5.0 µg FSH/h (6.2 ± 2.0 ovulations/ewe, n=6) were significantly higher (P< 0.01) than that of control ewes (1.3 ± 0.1 ovulations/ewe, n=16). Mean plasma concentrations of FSH were also raised above normal by these doses of FSH. Plasma concentrations of FSH were reduced below normal by twice daily administration of steroid-free bovine follicular fluid (bFF) for 48 h from the initiation of luteolysis. As a consequence follicles failed to achieve ovulatory maturity. Large follicles (?5mm diameter) from ewes treated with bFF for 48 h had reduced concentrations of oestradiol-17b in follicular fluid, fewer granulosa cells, and the cells had a reduced ability to metabolise testosterone to oestradiol-17b and to produce cyclic AMP when challenged with FSH or LH. |
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Palavras-Chave: |
Follicle stimulating hormone; FSH; Ovulation rate. |
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Thesagro: |
Fisiologia; Hormônio; Ovino; Ovulação; Reprodução. |
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Thesaurus Nal: |
Follicular fluid; Gonadotropins; Granulosa cells; Reproduction; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
null
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
