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Registro Completo |
Biblioteca(s): |
Embrapa Rondônia. |
Data corrente: |
31/01/2022 |
Data da última atualização: |
31/01/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
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. |
Afiliação: |
INGRID P. BARBOSA, Universidade Federal do Acre (Ufac); JAMYLE P. CESTARO, Universidade Federal do Acre (Ufac); SAMIRA A. SILVA, Centro Universitario Aparício Carvalho (FIMCA); GABRIELLY S. NOLETO, Centro Universitario Aparício Carvalho (FIMCA); REUEL L. GONÇALVES, Biogênesis Bago Saúde Animal, Curitiba, PR; GEORGE M. SILVA, Universidade Federal de Rondonia (UNIR); FELIPE H. PAES, Centro Universitario Aparício Carvalho (FIMCA); BERNARDO G. GASPERIN, Universidade Federal de Pelotas (Ufpel); MONIQUE T. ROVANI, Universidade Federal do Rio Grande do Sul (UFRGS); LUIZ FRANCISCO MACHADO PFEIFER, CPAF-RO. |
Título: |
GnRH34: an alternative for increasing pregnancy in timed AI beef cows. |
Ano de publicação: |
2022 |
Fonte/Imprenta: |
Theriogenology, v. 179, p. 1-254, Feb. 2022. |
ISSN: |
0093-691X |
DOI: |
https://doi.org/10.1016/j.theriogenology.2021.11.014 |
Idioma: |
Inglês |
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 |
Palavras-Chave: |
Gonadotropina. |
Thesagro: |
Fertilidade Animal; Gado de Corte; Gado Nelore; Hormônio; Inseminação Artificial; Ovulação; Reprodução Animal; Vaca de Corte. |
Thesaurus Nal: |
Animal fertility; Animal reproduction; Artificial insemination; Beef cattle; Beef cows; Gonadotropin-releasing hormone; Nellore; Ovulation. |
Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
Marc: |
LEADER 03532naa a2200457 a 4500 001 2139488 005 2022-01-31 008 2022 bl uuuu u00u1 u #d 022 $a0093-691X 024 7 $ahttps://doi.org/10.1016/j.theriogenology.2021.11.014$2DOI 100 1 $aBARBOSA, I. P. 245 $aGnRH34$ban alternative for increasing pregnancy in timed AI beef cows.$h[electronic resource] 260 $c2022 520 $aTwo 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. 650 $aAnimal fertility 650 $aAnimal reproduction 650 $aArtificial insemination 650 $aBeef cattle 650 $aBeef cows 650 $aGonadotropin-releasing hormone 650 $aNellore 650 $aOvulation 650 $aFertilidade Animal 650 $aGado de Corte 650 $aGado Nelore 650 $aHormônio 650 $aInseminação Artificial 650 $aOvulação 650 $aReprodução Animal 650 $aVaca de Corte 653 $aGonadotropina 700 1 $aCESTARO, J. P. 700 1 $aSILVA, S. A. 700 1 $aNOLETO, G. S. 700 1 $aGONÇALVES, R. L. 700 1 $aSILVA, G. M. 700 1 $aPAES, F. H. 700 1 $aGASPERIN, B. G. 700 1 $aROVANI, M. T. 700 1 $aPFEIFER, L. F. M. 773 $tTheriogenology$gv. 179, p. 1-254, Feb. 2022.
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11. | | SOUZA, V. L. de; GOMES, L. S.; MELO, T. da S.; PFEIFER, L. F. M. Comparação entre Promov® e um análogo de GnRH na indução de ovulação de vacas de corte pós-parto. In: ENCONTRO DE INICIAÇÃO À PESQUISA, 13.; ENCONTRO DE PÓS-GRADUAÇÃO DA EMBRAPA RONDÔNIA, 8., 2023, Porto Velho. Inovações metodológicas para pesquisa agropecuária: anais. Porto Velho: Embrapa Rondônia, 2024. p. 31. (Embrapa Rondônia. Eventos técnicos & científicos, 1).Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Rondônia. |
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14. | | CAMARGO, L. S. de A.; OLIVEIRA, C. S.; PFEIFER, L. F. M.; MACHADO, R. Avanços e inovações em biotécnicas da reprodução em bovinos de leite. In: VILELA, D.; FERREIRA, R. de P.; FERNANDES, E. N.; JUNTOLLI, F. V. (Ed.). Pecuária de leite no Brasil: cenários e avanços tecnológicos. Brasília, DF: Embrapa, 2016. p. 325-343.Tipo: Capítulo em Livro Técnico-Científico |
Biblioteca(s): Embrapa Gado de Leite; Embrapa Pecuária Sudeste. |
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18. | | DADARWAL, D.; MAPLETOFT, R. J.; ADAMS, G. P.; PFEIFER, L. F. M.; CREELMAN, C.; SINGH, J. Effect of progesterone concentration and duration of proestrus on fertility in beef cattle after fixed-time artificial insemination. Theriogenology, v. 79, n. 5, p. 859-866, mar. 2013.Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
Biblioteca(s): Embrapa Rondônia. |
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