Data/hora: 23/06/2024 01:05:03

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 17/07/2020
Data da última atualização: | 25/11/2021
Autoria: | FIGUEIRA, L. M.; ALVES, N. G.; MAIA, A. L. R. e S.; SOUZA-FABJAN, J. M. de; BATISTA, R. I. T. P.; MORAIS, M. C. da C.; LIMA, R. R. de; OLIVEIRA, M. E. F.; FONSECA, J. F. da.
Afiliação: | LUCAS MACHADO FIGUEIRA, Universidade Federal de Lavras (UFLA) - Lavras, MG, Brazil; NADJA GOMES ALVES, Universidade Federal de Lavras (UFLA) - Lavras, MG, Brazil; ANA LUCIA ROSA E SILVA MAIA, Universidade Federal Fluminense (UFF) - Niterói, RJ, Brazil; JOANNA MARIA GONÇALVES DE SOUZA-FABJAN, Universidade Federal Fluminense (UFF) - Niterói, RJ, Brazil; RIBRIO IVAN TAVARES PEREIRA BATISTA, Universidade Federal Fluminense (UFF) - Niterói, RJ, Brazil; MARIA CLARA DA CRUZ MORAIS, Universidade Federal Fluminense (UFF) - Niterói, RJ, Brazil; RENATO RIBEIRO DE LIMA, Universidade Federal de Lavras (UFLA) - Lavras, MG, Brazil; MARIA EMILIA FRANCO OLIVEIRA, Universidade Estadual Paulista“Júlio de Mesquita Filho (UNESP) - Jaboticabal, SP, Brazil; JEFERSON FERREIRA DA FONSECA, CNPC.
Título: | Embryo yield and quality are associated with progestogen treatment during superovulation protocol in lactating Lacaune ewes.
Ano de publicação: | 2020
Fonte/Imprenta: | Theriogenology, v. 155, p. 132-138, Oct. 2020.
DOI: | https://doi.org/10.1016/j.theriogenology.2020.06.004
Idioma: | Inglês
Conteúdo: | Abstract: This study assessed the effect of progestogen treatment length on ovarian parameters and embryo yield in superovulated Lacaune ewes collected by nonsurgical embryo recovery. Twenty-three lactating ewes were superovulated 30 d apart using a cross-over design. All ewes received 60 mg of MAP intravaginal sponges for 6 (G-6 group) or 9 (G-9 group) d. A total dose of 133 mg pFSH was given in six decreasing doses (twice a day) starting at 60 h before device removal. Ultrasound examination of the ovaries was performed at the first pFSH injection and one day before embryo recovery, which was performed 6?7 d after the onset of estrus. Embryo recovery was conducted only in ewes that expressed estrus and were mated. There was no difference (P > 0.05) in the total number of follicles between G-6 (15.7 ± 1.0) and G-9 (15.6 ± 0.8) at the time of the first pFSH treatment. The percentage of responding donors with ?3 corpora lutea (CL; 78.2% [18/23] vs 69.5% [16/23]), mean (±SEM) CL number (7.0 ± 1.2 vs 8.1 ± 1.6), transcervical passage rate (94.4% [17/18] vs 83.3% [15/18], and ova/embryo recovery rate (54.5% [60/110] vs 68.0% [83/122]) were not different (P > 0.05) between the G-6 and G-9 groups. However, the mean number of viable embryos was lower (P < 0.05) in the G-6 group (1.8 ± 0.7) than in the G-9 group. (3.5 ± 1.1). In conclusion, treatment with an intravaginal MAP sponge for 9 d during a superovulation protocol is beneficial for viable embryo yield in Lacaune ewes out of the breeding season.
Palavras-Chave: | MOET; Transcervical; Uterine flushing.
Thesaurus Nal: | Animal reproduction; Dairy sheep; Embryo transfer; Superovulation.
Categoria do assunto: | --
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (39614-1) - UPC - AP - DD -  -  -  - DIS