Efeito do intervalo entre recrutamentos foliculares na superovulação de vacas da raça Holandesa não-lactantes
Data
2007-08-01
Autores
Santos, R. M. [UNESP]
Vasconcelos, José Luiz Moraes [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal de Minas Gerais (UFMG), Escola de Veterinária
Resumo
Vacas da raça Holandesa não-lactantes, distribuídas em dois grupos, foram sincronizadas com o protocolo Ovsynch modificado. No dia sete (dia 0 = dia do segundo GnRH), o grupo 7 (G-7; n=19) recebeu CIDR usado previamente por cinco dias e 100mcg de GnRH, e o grupo 14 (G-14; n=21), CIDR e 25mg de PGF2alfa. No dia 14 foi aspirado o folículo dominante (FD), trocado o CIDR usado por um novo e foram aplicados 25mg de PGF2alfa. Iniciou-se o tratamento com FSH 36h depois, removeu-se o CIDR com o sétimo FSH e aplicou-se GnRH 36h depois. As inseminações foram feitas 12 e 24h depois. Recuperaram-se os embriões sete dias depois da inseminação artificial. O diâmetro do FD no G-7 foi 13,1±0,57mm no dia sete e 11,2±0,57mm no dia 14. O diâmetro FD persistente no G-14 aumentou de 12,6±0,55mm no dia sete para 16,4±0,55mm no dia 14 (P<0,001). O número de folículos >8mm, 48h após o início do tratamento com FSH, foi maior (P<0,05) no G-7 (15,6±0,05) que no G-14 (12,5±0,05). Não foi detectado efeito de tratamento sobre o número de corpos lúteos e de embriões. O menor intervalo entre recrutamentos foliculares aumentou o número de folículos recrutados, porém não alterou a quantidade e a qualidade dos embriões produzidos.
Dry Holstein cows were synchronized by a modified Ovsynch protocol. on day 7 (day 0 = day of the second GnRH), group 7 (G-7; n=19) received an used CIDR and GnRH (100µg). Group 14 (G-14; n=21) received an used CIDR and PGF2alpha (25mg). on day 14, the dominant follicle (DF) was removed, by aspiration; the used CIDR was changed for a new CIDR plus PGF2alpha. Thirty-six hours later, the FSH treatment was initiated. on the seventh injection of FSH, the CIDR was removed. Thirty-six hours after, the cows received GnRH. Donors were inseminated 12 and 24h after the GnRH injection. Embryos were recovered seven days after AI. The DF diameter in G-7 was 13.1mm on day 7 and 11.2mm on day 14. The persistent DF in the G-14 increased from 12.6mm on day 7 to 16.4mm on day 14 (P<0.001). The number of follicles >8mm, 48h after the beginning of the FSH treatment, was 15.6 in G-7 and 12.5 in G-14 (P<0.05). No treatment effects were detected on number of corpus luteum and embryos. The shorter interval between follicular recruitment the higher the number of recruited follicles, but it did not have effects on the number or quality of embryos produced.
Dry Holstein cows were synchronized by a modified Ovsynch protocol. on day 7 (day 0 = day of the second GnRH), group 7 (G-7; n=19) received an used CIDR and GnRH (100µg). Group 14 (G-14; n=21) received an used CIDR and PGF2alpha (25mg). on day 14, the dominant follicle (DF) was removed, by aspiration; the used CIDR was changed for a new CIDR plus PGF2alpha. Thirty-six hours later, the FSH treatment was initiated. on the seventh injection of FSH, the CIDR was removed. Thirty-six hours after, the cows received GnRH. Donors were inseminated 12 and 24h after the GnRH injection. Embryos were recovered seven days after AI. The DF diameter in G-7 was 13.1mm on day 7 and 11.2mm on day 14. The persistent DF in the G-14 increased from 12.6mm on day 7 to 16.4mm on day 14 (P<0.001). The number of follicles >8mm, 48h after the beginning of the FSH treatment, was 15.6 in G-7 and 12.5 in G-14 (P<0.05). No treatment effects were detected on number of corpus luteum and embryos. The shorter interval between follicular recruitment the higher the number of recruited follicles, but it did not have effects on the number or quality of embryos produced.
Descrição
Palavras-chave
bovino, aspiração folicular, embrião, FSH, superovulação, dairy cow, follicular ablation, embryo, FSH, superovulation
Como citar
Arquivo Brasileiro de Medicina Veterinária e Zootecnia. Universidade Federal de Minas Gerais, Escola de Veterinária, v. 59, n. 4, p. 844-850, 2007.