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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
04/01/2011 |
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Data da última atualização: |
30/06/2023 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
MACHADO, R.; BERGAMASCHI, M. A. C. M.; OLIVEIRA, C. A.; BINELLI, M. |
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Afiliação: |
RUI MACHADO, CPPSE; MARCO AURELIO C MEIRA BERGAMASCHI, CPPSE; C. A. OLIVEIRA, DOCENTE USP; M. BINELLI, DOCENTE USP/SÃO PAULO. |
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Título: |
Ovarian function in Nelore beef cows (Bos indicus) after different hormonal treatments to induce ovulation. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
In: INTERNATIONAL RUMINANT REPRODUCTION, 8., 2010, Anchorage. Proceedings... Missouri: University of Missouri, 2010, |
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Idioma: |
Português |
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Conteúdo: |
Synchronization of ovulation is a tool to carry out timed artificial insemination. However, available protocols to induce ovulation provide variable results. This study evaluated different treatments to induce ovulation in Nelore (Bos indicus) cows. Group GnRH/PGF2 (n=40) received the Ovsynch protocol1 based on the administration of two injections of GnRH agonist (Buserelin acetate; 8 g i.m.) given 9 d apart and a PGF2 analogue (d-Cloprostenol; 0.15 mg i.m.) given 48 h before the 2nd GnRH injection; Group Norg (n=30): animals received 3 mg Norgestomet and 5 mg Estradiol valerate i.m. with an auricular implant containing 3 mg Norgestomet at an unknown stage of the oestrous cycle (d 0). On d 9, the implant was withdrawn; and group NorgeCG (n=30): same treatment as Norg plus Equine Chorionic Gonadotrophin (eCG; 400 IU, i.m.) at implant removal2. Ovulation rate was determined by ultrasound and cows that ovulated were submitted daily to transrectal ultrasound assessment of follicular and luteal dynamics, as well as determination of plasma progesterone concentration (P4) up to the subsequent natural ovulation. All treatments induced synchronized ovulation in most cows (62.5%, 70.0% and 70.0% respectively to GnRH/PGF2, Norg and NorgeCG; P>0.05). Inter-ovulatory interval (22.50.7 d) as well as diameter of the dominant follicle at luteolysis (9.61.1 mm) and preovulatory follicle diameter at the induced (12.730.69 mm) and subsequent natural (13.170.52 mm) cycle were not affected (P>0.05) by treatments. Overall function of the corpus luteum (CL) generated after induced ovulation was affected by treatments (P<0.05), except the luteal phase length, which was similar among cows (17.60.5 d). Respectively for GnRH/PGF2, Norg, and NorgeCG, the maximum volume of CL (mm3) was: 7117.3125.7a, 5437.8405.9b and 6927.5405.9a; the day of CL maximum volume was: 14.40.6a, 7.70.5c and 9.20.5b; the plasma P4 concentration (ng/mL) at that day was: 6.21.7a, 4.50.5b and 6.10.5a; the highest plasma P4 (ng/mL) in the estrous cycle subsequent to induction of ovulation was 6.81.7 b, 6.40.6b and 8.20.6a and the day in the estrous cycle of highest plasma P4 was 13.40.6a, 11.40.6b and 11.30.6b. In conclusion, GnRH/PGF2 based protocol delays the increase in progesterone concentration after synchronized ovulation, which can be potentially hazardous to embryo transport, maternal recognition of pregnancy and maintenance of early gestation3. eCG may be added to the Norg protocol when luteal function is to be optimized because it increased the dimensions of the CL and concentration of progesterone over the subsequent estrous cycle compared to Norg alone. MenosSynchronization of ovulation is a tool to carry out timed artificial insemination. However, available protocols to induce ovulation provide variable results. This study evaluated different treatments to induce ovulation in Nelore (Bos indicus) cows. Group GnRH/PGF2 (n=40) received the Ovsynch protocol1 based on the administration of two injections of GnRH agonist (Buserelin acetate; 8 g i.m.) given 9 d apart and a PGF2 analogue (d-Cloprostenol; 0.15 mg i.m.) given 48 h before the 2nd GnRH injection; Group Norg (n=30): animals received 3 mg Norgestomet and 5 mg Estradiol valerate i.m. with an auricular implant containing 3 mg Norgestomet at an unknown stage of the oestrous cycle (d 0). On d 9, the implant was withdrawn; and group NorgeCG (n=30): same treatment as Norg plus Equine Chorionic Gonadotrophin (eCG; 400 IU, i.m.) at implant removal2. Ovulation rate was determined by ultrasound and cows that ovulated were submitted daily to transrectal ultrasound assessment of follicular and luteal dynamics, as well as determination of plasma progesterone concentration (P4) up to the subsequent natural ovulation. All treatments induced synchronized ovulation in most cows (62.5%, 70.0% and 70.0% respectively to GnRH/PGF2, Norg and NorgeCG; P>0.05). Inter-ovulatory interval (22.50.7 d) as well as diameter of the dominant follicle at luteolysis (9.61.1 mm) and preovulatory follicle diameter at the induced (12.730.69 mm) and subsequent natural (13.170.52 mm) cycle were not affected (P>0.... Mostrar Tudo |
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Palavras-Chave: |
Hormanal treatment; Ovarian. |
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Thesaurus Nal: |
reproduction. |
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Categoria do assunto: |
G Melhoramento Genético |
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Marc: |
LEADER 03305nam a2200181 a 4500
001 1871524
005 2023-06-30
008 2010 bl uuuu u00u1 u #d
100 1 $aMACHADO, R.
245 $aOvarian function in Nelore beef cows (Bos indicus) after different hormonal treatments to induce ovulation.$h[electronic resource]
260 $aIn: INTERNATIONAL RUMINANT REPRODUCTION, 8., 2010, Anchorage. Proceedings... Missouri: University of Missouri, 2010,$c2010
520 $aSynchronization of ovulation is a tool to carry out timed artificial insemination. However, available protocols to induce ovulation provide variable results. This study evaluated different treatments to induce ovulation in Nelore (Bos indicus) cows. Group GnRH/PGF2 (n=40) received the Ovsynch protocol1 based on the administration of two injections of GnRH agonist (Buserelin acetate; 8 g i.m.) given 9 d apart and a PGF2 analogue (d-Cloprostenol; 0.15 mg i.m.) given 48 h before the 2nd GnRH injection; Group Norg (n=30): animals received 3 mg Norgestomet and 5 mg Estradiol valerate i.m. with an auricular implant containing 3 mg Norgestomet at an unknown stage of the oestrous cycle (d 0). On d 9, the implant was withdrawn; and group NorgeCG (n=30): same treatment as Norg plus Equine Chorionic Gonadotrophin (eCG; 400 IU, i.m.) at implant removal2. Ovulation rate was determined by ultrasound and cows that ovulated were submitted daily to transrectal ultrasound assessment of follicular and luteal dynamics, as well as determination of plasma progesterone concentration (P4) up to the subsequent natural ovulation. All treatments induced synchronized ovulation in most cows (62.5%, 70.0% and 70.0% respectively to GnRH/PGF2, Norg and NorgeCG; P>0.05). Inter-ovulatory interval (22.50.7 d) as well as diameter of the dominant follicle at luteolysis (9.61.1 mm) and preovulatory follicle diameter at the induced (12.730.69 mm) and subsequent natural (13.170.52 mm) cycle were not affected (P>0.05) by treatments. Overall function of the corpus luteum (CL) generated after induced ovulation was affected by treatments (P<0.05), except the luteal phase length, which was similar among cows (17.60.5 d). Respectively for GnRH/PGF2, Norg, and NorgeCG, the maximum volume of CL (mm3) was: 7117.3125.7a, 5437.8405.9b and 6927.5405.9a; the day of CL maximum volume was: 14.40.6a, 7.70.5c and 9.20.5b; the plasma P4 concentration (ng/mL) at that day was: 6.21.7a, 4.50.5b and 6.10.5a; the highest plasma P4 (ng/mL) in the estrous cycle subsequent to induction of ovulation was 6.81.7 b, 6.40.6b and 8.20.6a and the day in the estrous cycle of highest plasma P4 was 13.40.6a, 11.40.6b and 11.30.6b. In conclusion, GnRH/PGF2 based protocol delays the increase in progesterone concentration after synchronized ovulation, which can be potentially hazardous to embryo transport, maternal recognition of pregnancy and maintenance of early gestation3. eCG may be added to the Norg protocol when luteal function is to be optimized because it increased the dimensions of the CL and concentration of progesterone over the subsequent estrous cycle compared to Norg alone.
650 $areproduction
653 $aHormanal treatment
653 $aOvarian
700 1 $aBERGAMASCHI, M. A. C. M.
700 1 $aOLIVEIRA, C. A.
700 1 $aBINELLI, M.
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Embrapa Pecuária Sudeste (CPPSE) |
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| Registros recuperados : 37 | |
| 8. |  | 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. |
|    |
| 14. | | 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. |
|  |
| 16. | | 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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| 17. | | 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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| 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.; 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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| 20. | | MACHADO, R.; SILVA, J. C. B. da; BARBOSA, R. T.; BISINOTTO, R. S.; SIQUEIRA, A. E. P.; BINELLI, M. R. Remoção farmacológica ou mecânica do folículo dominante como estratégia antí-luteolítica em bovinos. Revista Acta Scientie Vetrinariae, v.34, n.(supl. 1), p. s334, 2006.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: -- - A |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| Registros recuperados : 37 | |
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