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 | Acesso ao texto completo restrito à biblioteca da Embrapa Pecuária Sudeste. Para informações adicionais entre em contato com cppse.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
17/12/2008 |
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Data da última atualização: |
07/03/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MACHADO, R.; BERGAMASCHI, M. A. C. M.; BARBOSA, R. T.; OLIVIEIRA, C. A.; BINELLI, M. |
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Afiliação: |
RUI MACHADO, CPPSE; MARCO AURELIO C MEIRA BERGAMASCHI, CPPSE; ROGERIO TAVEIRA BARBOSA, CPPSE; C. A. OLIVEIRA, USP-FMVZ; M. BINELLI, USP-FMVZ. |
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Título: |
Ovarian function in Nelore (Bos taurus indicus) cows after post-ovulation hormonal treatments. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
Theriogenology, v. 69, n. 7, 798-804, apr. 2008. |
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DOI: |
10.1016/j.theriogenology.2007.10.025 |
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Idioma: |
Inglês |
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Conteúdo: |
Maternal recognition of pregnancy in the cow requires successful signaling by the conceptus to block luteolysis. Conceptus growth and function depend on an optimal uterine environment, regulated by luteal progesterone. The objective of this study was to test strategies to optimize luteal function, as well as prevent a dominant follicle from initiating luteolysis. Nelore (Bos taurus indicus) beef cows (n = 40) were submitted to a GnRH/PGF2?/GnRH protocol. Cows that ovulated from a dominant ovarian follicle (ovulation = Day 0) were allocated to receive: no additional treatment (GC; n = 7); 3000 IU of hCG on Day 5 (GhCG; n = 5); 5 mg of estradiol-17? on Day 12 (GE2; n = 6); or 3000 IU of hCG on Day 5 and 5 mg of estradiol-17? on Day 12 (GhCG/E2; n = 5). Ultrasonographic imaging of the ovaries, assessment of plasma progesterone concentration, and detection of estrus were done daily from Day 5 to the day of subsequent ovulation. Treatment with hCG induced an accessory CL, increased CL volume, and plasma progesterone concentration throughout the luteal phase (P < 0.01). Estradiol-17? induced atresia and recruitment of a new wave of follicular growth; it eliminated a potentially estrogen-active, growing ovarian follicle within the critical period for maternal recognition of pregnancy, but it also hastened luteolysis (Days 16 or 17 vs. Days 18 or 19 in non-treated cows). In conclusion, the approaches tested enhanced luteal function (hCG) and altered ovarian follicular dynamics (estradiol-17?), but were unable to extend the life-span of the CL in Nelore cows. MenosMaternal recognition of pregnancy in the cow requires successful signaling by the conceptus to block luteolysis. Conceptus growth and function depend on an optimal uterine environment, regulated by luteal progesterone. The objective of this study was to test strategies to optimize luteal function, as well as prevent a dominant follicle from initiating luteolysis. Nelore (Bos taurus indicus) beef cows (n = 40) were submitted to a GnRH/PGF2?/GnRH protocol. Cows that ovulated from a dominant ovarian follicle (ovulation = Day 0) were allocated to receive: no additional treatment (GC; n = 7); 3000 IU of hCG on Day 5 (GhCG; n = 5); 5 mg of estradiol-17? on Day 12 (GE2; n = 6); or 3000 IU of hCG on Day 5 and 5 mg of estradiol-17? on Day 12 (GhCG/E2; n = 5). Ultrasonographic imaging of the ovaries, assessment of plasma progesterone concentration, and detection of estrus were done daily from Day 5 to the day of subsequent ovulation. Treatment with hCG induced an accessory CL, increased CL volume, and plasma progesterone concentration throughout the luteal phase (P < 0.01). Estradiol-17? induced atresia and recruitment of a new wave of follicular growth; it eliminated a potentially estrogen-active, growing ovarian follicle within the critical period for maternal recognition of pregnancy, but it also hastened luteolysis (Days 16 or 17 vs. Days 18 or 19 in non-treated cows). In conclusion, the approaches tested enhanced luteal function (hCG) and altered ovarian follicular dynamics (estr... Mostrar Tudo |
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Palavras-Chave: |
Antiluteolytic strategies; Ovary. |
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Thesagro: |
Estradiol. |
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Thesaurus Nal: |
cattle; gonadotropins. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
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001 1048694
005 2023-03-07
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024 7 $a10.1016/j.theriogenology.2007.10.025$2DOI
100 1 $aMACHADO, R.
245 $aOvarian function in Nelore (Bos taurus indicus) cows after post-ovulation hormonal treatments.$h[electronic resource]
260 $c2008
520 $aMaternal recognition of pregnancy in the cow requires successful signaling by the conceptus to block luteolysis. Conceptus growth and function depend on an optimal uterine environment, regulated by luteal progesterone. The objective of this study was to test strategies to optimize luteal function, as well as prevent a dominant follicle from initiating luteolysis. Nelore (Bos taurus indicus) beef cows (n = 40) were submitted to a GnRH/PGF2?/GnRH protocol. Cows that ovulated from a dominant ovarian follicle (ovulation = Day 0) were allocated to receive: no additional treatment (GC; n = 7); 3000 IU of hCG on Day 5 (GhCG; n = 5); 5 mg of estradiol-17? on Day 12 (GE2; n = 6); or 3000 IU of hCG on Day 5 and 5 mg of estradiol-17? on Day 12 (GhCG/E2; n = 5). Ultrasonographic imaging of the ovaries, assessment of plasma progesterone concentration, and detection of estrus were done daily from Day 5 to the day of subsequent ovulation. Treatment with hCG induced an accessory CL, increased CL volume, and plasma progesterone concentration throughout the luteal phase (P < 0.01). Estradiol-17? induced atresia and recruitment of a new wave of follicular growth; it eliminated a potentially estrogen-active, growing ovarian follicle within the critical period for maternal recognition of pregnancy, but it also hastened luteolysis (Days 16 or 17 vs. Days 18 or 19 in non-treated cows). In conclusion, the approaches tested enhanced luteal function (hCG) and altered ovarian follicular dynamics (estradiol-17?), but were unable to extend the life-span of the CL in Nelore cows.
650 $acattle
650 $agonadotropins
650 $aEstradiol
653 $aAntiluteolytic strategies
653 $aOvary
700 1 $aBERGAMASCHI, M. A. C. M.
700 1 $aBARBOSA, R. T.
700 1 $aOLIVIEIRA, C. A.
700 1 $aBINELLI, M.
773 $tTheriogenology$gv. 69, n. 7, 798-804, apr. 2008.
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Registro original: |
Embrapa Pecuária Sudeste (CPPSE) |
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| Registros recuperados : 37 | |
| 4. |  | PUGLIESI, G.; SANTOS, F. B.; LOPES, E.; NOGUEIRA, E.; MAIO, J. R. G.; BINELLI, M. Improved fertility in suckled beef cows ovulating large follicles or supplemented with long-acting progesterone after timed-AI. Theriogenology, n. 85, n. 7, p. 1239-1248, April 2016.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Pantanal. |
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| 12. | | MACHADO, R.; BERGAMASCHI, M. A. C. M.; BARBOSA, R. T.; OLIVIEIRA, C. A.; BINELLI, M. Effects of estradiol-17Beta on ovarian function and preganancy in Nelore cows. In: INTERNATIONAL SYMPOSIUM ON ANIMAL BIOLOGY OF REPRODUCTION, 2., 2008, São Paulo, SO. Absracts... São Paulo: CBRA, 2008. p. 268. p. 228.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
|  |
| 16. | | MACHADO, R.; SUDANO, M. J.; PASCHOAL, D. M.; NOGUEIRA, G. P.; BERTAN, C. M.; LANDIM-ALVARENGA, F. .C.; BINELLI, M. Hormonal treatment to improve embryo survival in beef cows after fixed time artificial insemination. In: IV International Symposium on Animal Biology of Reproduction (ISABR 2012). Animal Reproduction, v.9, n.4, p.859, 2012.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 17. | | MACHADO, R.; BERGAMASCHI, M. A. C. M.; FIGUEIREDO, R. A.; BARBOSA, R. T.; ANDREO, R.; BERTAN, C. M.; BINELLI, M. Comportamento reprodutivo e função ovariana em vacas de corte Nelore (Bos taurus indicus) após indução da ovulação e tratamento com GnRH e hCG. Acta Scientiae Veterinariae, v. 36, Supl. 2, s451, 2008.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 18. | | MACHADO, R.; BERGAMASCHI, M. A. C. M.; ALMEIDA, R. G.; SUDANO, M. J.; ALENCAR, M. M. de; BINELLI, M. Progestogen or GnRH-hCG supplementation after artificial insemination in postpartum beef cows. In: 26th Annual Meeting of the Brazilian Embryo Technology Society (SBTE). Animal Reproduction, v.9, n.3, p.534, 2012.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 19. | | MACHADO, R.; BERGAMASCHI, M. A. C. M.; BARBOSA, R. T.; BARBOSA, R. T.; ALENCAR, M. M. de; BINELLI, M. Taxas de serviço, concepção e prenhez de vacas Nelore tratadas com gonadotrofina coriônica humana e 17B-estradiol após a inseminação artificial em tempo fixo. Brazilian Journal of Veterinary Research and Animal Science, v. 45, n. 3, p. 221-230, 2008.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Nacional - A |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 20. | | MACHADO, R.; BERGAMASCHI, M. A. C. M.; BARBOSA, R. T.; MADUREIRA, E. H.; FANTINI, D.; BINELLI, M. Strategies to prevent the presence of a dominant follicle (DF) between days 15 and 20 of the cow estrous cycle. In: INTERNATIONAL CONGRESS ON ANIMAL REPRODUCTION, 15., 2004, Porto Seguro, BA. Porto Seguro: ICAR, 2004. p.118.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| Registros recuperados : 37 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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