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Registro Completo |
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Biblioteca(s): |
Embrapa Rondônia. |
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Data corrente: |
31/01/2022 |
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Data da última atualização: |
25/09/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BARBOSA, I. P.; CESTARO, J. P.; SILVA, S. A.; NOLETO, G. S.; GONÇALVES, R. L.; SILVA, G. M.; PAES, F. H.; GASPERIN, B. G.; ROVANI, M. T.; PFEIFER, L. F. M. |
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Afiliação: |
INGRID P. BARBOSA, UNIVERSIDADE FEDERAL DO ACRE; JAMYLE P. CESTARO, UNIVERSIDADE FEDERAL DO ACRE; SAMIRA A. SILVA, CENTRO UNIVERSITARIO APARÍCIO CARVALHO; GABRIELLY S. NOLETO, CENTRO UNIVERSITARIO APARÍCIO CARVALHO; REUEL L. GONÇALVES, BIOGÊNESIS BAGO SAÚDE ANIMAL; GEORGE M. SILVA, UNIVERSIDADE FEDERAL DE RONDONIA; FELIPE H. PAES, CENTRO UNIVERSITARIO APARÍCIO CARVALHO; BERNARDO G. GASPERIN, UNIVERSIDADE FEDERAL DE PELOTAS; MONIQUE T. ROVANI, UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL; LUIZ FRANCISCO MACHADO PFEIFER, CPAF-RO. |
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Título: |
GnRH34: an alternative for increasing pregnancy in timed AI beef cows. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Theriogenology, v. 179, p. 1-254, Feb. 2022. |
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ISSN: |
0093-691X |
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DOI: |
https://doi.org/10.1016/j.theriogenology.2021.11.014 |
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Idioma: |
Inglês |
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Conteúdo: |
Two experiments evaluated the effects of gonadotropin releasing hormone (GnRH) treatment on fertility of suckled Nelore beef cows treated with an estradiol/progesterone (P4)-based protocol for timed artificial insemination (TAI). Experiment 1 was designed to determine the effect of GnRH administered 34 h after P4 insert removal (GnRH34) on time of ovulation. Suckled cows (n = 34) were treated with 2 mg estradiol benzoate (EB) and an intravaginal insert containing 1.9 g of P4. Eight days later, P4 inserts were removed, and all cows received 150 ug of d-cloprostenol (prostaglandin F2 alpha analogue), 300 IU of eCG, and 1 mg of estradiol cypionate (ECP). On Day 9 (05:00 p.m.), cows were randomly distributed, according to the diameter of the pre-ovulatory follicle, in two treatments: 1) GnRH (n = 17) cows that received 10.5 ug of buserelin acetate, or 2) no further treatment (control, n = 17). Cows treated with GnRH 34 h after P4 insert removal ovulated earlier (P = 0.02) than control cows (66 ± 0.0 and 77.2 ± 4.3 h). Experiment 2 was designed to determine the effect of GnRH34 on the fertility of suckled beef cows. Nelore cows (n = 506) were treated as Experiment 1. On Day 8, cows were painted in the sacrocaudal region to identify cows that displayed estrus. On Day 9 (05:00 p.m.), cows were randomized to receive same treatment as Experiment 1, control (n = 252), or GnRH (n = 254). All cows were TAI 48 h after P4 insert removal. At TAI, estrus was evaluated, and deemed to have occurred in cows without a tail-head chalk mark (>75% paint loss). Cows treated with GnRH 34 h after P4 insert removal had greater (P = 0.01) pregnancy per AI (P/AI) than cows that only received ECP (63.0% and 50.4%). No difference (P = 0.5) was observed in the proportion of cows that displayed estrus between treatments. Furthermore, cows that displayed estrus had greater (P < 0.01) P/AI than cows that did not. Treatment with GnRH, given at 34 h after P4 insert removal, increased (P < 0.05) P/AI in cows that did not show estrus at TAI. In summary, treatment with GnRH 34 h after P4 insert removal was associated with earlier ovulation and resulted in greater P/AI in suckled Nelore cows treated with an estradiol/P4-based protocol for TAI. MenosTwo experiments evaluated the effects of gonadotropin releasing hormone (GnRH) treatment on fertility of suckled Nelore beef cows treated with an estradiol/progesterone (P4)-based protocol for timed artificial insemination (TAI). Experiment 1 was designed to determine the effect of GnRH administered 34 h after P4 insert removal (GnRH34) on time of ovulation. Suckled cows (n = 34) were treated with 2 mg estradiol benzoate (EB) and an intravaginal insert containing 1.9 g of P4. Eight days later, P4 inserts were removed, and all cows received 150 ug of d-cloprostenol (prostaglandin F2 alpha analogue), 300 IU of eCG, and 1 mg of estradiol cypionate (ECP). On Day 9 (05:00 p.m.), cows were randomly distributed, according to the diameter of the pre-ovulatory follicle, in two treatments: 1) GnRH (n = 17) cows that received 10.5 ug of buserelin acetate, or 2) no further treatment (control, n = 17). Cows treated with GnRH 34 h after P4 insert removal ovulated earlier (P = 0.02) than control cows (66 ± 0.0 and 77.2 ± 4.3 h). Experiment 2 was designed to determine the effect of GnRH34 on the fertility of suckled beef cows. Nelore cows (n = 506) were treated as Experiment 1. On Day 8, cows were painted in the sacrocaudal region to identify cows that displayed estrus. On Day 9 (05:00 p.m.), cows were randomized to receive same treatment as Experiment 1, control (n = 252), or GnRH (n = 254). All cows were TAI 48 h after P4 insert removal. At TAI, estrus was evaluated, and deemed to have oc... Mostrar Tudo |
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Palavras-Chave: |
Gonadotropina. |
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Thesagro: |
Fertilidade Animal; Gado de Corte; Gado Nelore; Hormônio; Inseminação Artificial; Ovulação; Reprodução Animal; Vaca de Corte. |
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Thesaurus Nal: |
Animal fertility; Animal reproduction; Artificial insemination; Beef cattle; Beef cows; Gonadotropin-releasing hormone; Nellore; Ovulation. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
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Registro original: |
Embrapa Rondônia (CPAF-RO) |
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| Registros recuperados : 5 | |
| 3. |  | CHÁVEZ, D. W. H.; ASCHERI, J. L. R.; CARVALHO, C. W. P. de; BERNARDO, C. O.; DELIZA, R.; SÁ, D. de G. C. F. de; TELES, A. S. C.; QUEIROZ, V. A. V. Physicochemical properties, characteristics, and consumer acceptance of whole grain sorghum expanded extrudates. Journal of Food Processing and Preservation, 2021, 00 e 15837. 13 p.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Agroindústria de Alimentos; Embrapa Milho e Sorgo. |
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| 4. | | GALDEANO, M. C.; MENEZES, N. dos S.; CHÁVEZ, D. W. H.; SILVA, C. M.; SÁ, D. de G. C. F. de; CARVALHO, C. W. P. de; QUEIROZ, V. A. V.; MENEZES, C. B. de. Cereais matinais à base de sorgo produzidos em escala industrial. Rio de Janeiro: Embrapa Agroindústria de Alimentos, 2021. 22 p. (Embrapa Agroindústria de Alimentos. Boletim de Pesquisa e Desenvolvimento, 37).| Tipo: Boletim de Pesquisa e Desenvolvimento |
| Biblioteca(s): Embrapa Agroindústria de Alimentos; Embrapa Milho e Sorgo. |
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| 5. | | BERNARDO, C. O.; ASCHERI, J. L. R.; CARVALHO, C. W. P. de; CHÁVEZ, D. W. H.; MARTINS, I. B. A.; DELIZA, R.; SÁ, D. de G. C. F. de; QUEIROZ, V. A. V. Impact of extruded sorghum genotypes on the rehydration and sensory properties of soluble beverages and the Brazilian consumers' perception of sorghum and cereal beverage using word association. Journal of Cereal Science, London, v. 89, article 102793, 2019.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Milho e Sorgo. |
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| Registros recuperados : 5 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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