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Metadados | Descrição | Idioma |
---|---|---|
Autor(es): dc.contributor | Universidade Estadual Paulista (UNESP) | - |
Autor(es): dc.contributor | Chr. Hansen Animal Health & Nutrition | - |
Autor(es): dc.contributor | University of British Columbia | - |
Autor(es): dc.contributor | University of Florida | - |
Autor(es): dc.creator | Pereira, M. H.C. | - |
Autor(es): dc.creator | Cappellozza, B. I. | - |
Autor(es): dc.creator | Cerri, R. L.A. | - |
Autor(es): dc.creator | Sanches, C. P. | - |
Autor(es): dc.creator | Guida, T. G. | - |
Autor(es): dc.creator | Barbosa, L. F.S.P. | - |
Autor(es): dc.creator | Santos, J. E.P. | - |
Autor(es): dc.creator | Vasconcelos, J. L.M. | - |
Data de aceite: dc.date.accessioned | 2025-08-21T22:51:36Z | - |
Data de disponibilização: dc.date.available | 2025-08-21T22:51:36Z | - |
Data de envio: dc.date.issued | 2023-07-29 | - |
Data de envio: dc.date.issued | 2023-07-29 | - |
Data de envio: dc.date.issued | 2023-01-31 | - |
Fonte completa do material: dc.identifier | http://dx.doi.org/10.3168/jds.2022-22134 | - |
Fonte completa do material: dc.identifier | http://hdl.handle.net/11449/246702 | - |
Fonte: dc.identifier.uri | http://educapes.capes.gov.br/handle/11449/246702 | - |
Descrição: dc.description | This study was designed to evaluate whether the utilization of a second PGF2α treatment at the end of an estradiol/progesterone (E2/P4)-based protocol with or without GnRH at the beginning of the protocol would improve pregnancy rates of lactating Holstein cows assigned to timed embryo transfer. A total of 501 lactating Holstein cows in 5 farms were enrolled in the experiment. Within farm, cows were blocked by parity and, within block, were assigned randomly to (1) insertion of an intravaginal P4 device (controlled internal drug-releasing device; CIDR) and estradiol benzoate on d −11, PGF2α on d −4, CIDR withdrawal and an injection of estradiol cypionate on d −2, and timed embryo transfer on d 7 (1-PGF; n = 164); (2) the same treatments as 1-PGF, but with PGF2α administered on d −4 and −2 (2-PGF; n = 171); and (3) 2-PGF with the addition of a GnRH treatment on d −11 (GnRH+2-PGF; n = 166). Ovaries were scanned by transrectal ultrasonography on d −11, −4, and 7, and blood samples were collected on d −11, −4, 0, and 7 for P4 determination. Treatment comparisons were performed using contrasts. The proportion of cows with a new corpus luteum on d −4 was greater in GnRH+2-PGF cows. Cows in 1-PGF had a greater P4 concentration on d 0 but lesser P4 on d 7 compared with cows in the other groups. Cows assigned to receive 2-PGF (2-PGF and GnRH+2-PGF) had greater estrus expression, and a greater proportion of cows ovulated to estradiol cypionate. No further contrast effects were observed for follicle diameter, double ovulation rate, pregnancy per embryo transfer (P/ET) on d 32 and 60, or pregnancy loss. As P4 concentration on d −4 increased, P/ET on d 60 tended to increase. Cows with P4 ≥3.66 ng/mL on d −4 had greater P/ET on d 32 and 60 than those with P4 below that threshold. Regardless of treatment, cows with P4 concentration ≥3.66 ng/mL also had a greater pregnancy per synchronized protocol (P/SP) on d 60. Also, a P4 concentration on d −4 (low or high) × follicle diameter (continuous) interaction tendency was observed when evaluating P/ET. Although P/ET did not differ among cows with different follicles sizes with reduced P4 concentration on d −4 (<3.66 ng/mL), it increased in cows with larger follicles exposed to increased P4 concentration (≥3.66 ng/mL). When P4 on d 0 was evaluated, P/ET on d 32 and 60 was greater for cows with low (≤0.09 ng/mL) versus high (>0.21 ng/mL) P4; as P4 concentration on d 0 increased, P/ET linearly decreased. In summary, cows with increased P4 concentrations during growth of the ovulatory follicular wave had improved P/ET. Administering a second PGF2α dose reduced P4 concentration on d 0 and increased ovulatory response to the protocol, but no benefits were observed on P/ET or P/SP. | - |
Descrição: dc.description | Faculdade de Medicina Veterinária e Zootecnia Universidade Estadual Paulista (UNESP), SP | - |
Descrição: dc.description | Chr. Hansen Animal Health & Nutrition | - |
Descrição: dc.description | Faculty of Land and Food Systems University of British Columbia | - |
Descrição: dc.description | Department of Animal Sciences D.H. Barron Reproductive and Perinatal Biology Research Program University of Florida | - |
Descrição: dc.description | Department of Animal Production São Paulo State University | - |
Descrição: dc.description | Faculdade de Medicina Veterinária e Zootecnia Universidade Estadual Paulista (UNESP), SP | - |
Descrição: dc.description | Department of Animal Production São Paulo State University | - |
Formato: dc.format | 1414-1428 | - |
Idioma: dc.language | en | - |
Relação: dc.relation | Journal of Dairy Science | - |
???dc.source???: dc.source | Scopus | - |
Palavras-chave: dc.subject | embryo transfer | - |
Palavras-chave: dc.subject | gonadotropin-releasing hormone | - |
Palavras-chave: dc.subject | progesterone | - |
Palavras-chave: dc.subject | prostaglandin | - |
Título: dc.title | Effects of additional gonadotropin-releasing hormone and prostaglandin F2α treatment to an estradiol/progesterone-based embryo transfer protocol for recipient lactating dairy cows | - |
Tipo de arquivo: dc.type | livro digital | - |
Aparece nas coleções: | Repositório Institucional - Unesp |
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