Investigação

Início / Investigação / Apresentações / Superovulatory response of Portuguese Black Merino Ewes varies with FSH source, but not with season

Superovulatory response of Portuguese Black Merino Ewes varies with FSH source, but not with season

Ano
2006
Abstract

The effect of season of the year and FSH source was evaluated in a MOET program. In experiment 1, sixteen ewes in spring and 20 in fall were synchronized with intra-vaginal sponges and treated with ovine FSH, (1,25ml twice a day; oFSH, Ovagenâ) during four consecutive days and then intrauterine inseminated. Experiment 2 was conducted in spring with two groups of ewes receiving either Ovagenâ as previously, (Group 1; n=16) or 250 IU of porcine pituitary extract (pFSH; Plusetâ; Group 2 n=18) in six decreasing dosages over 3 days, at 12 hour intervals. Ovary examination and embryo recovery were done by laparotomy at day 6 or 7 after sponge removal and the number of corpora lutea (OR), unfertilized oocytes (UO), total embryos (TEMB) and number of freezable embryos (FEMB) were recorded. Recovery rates were calculated as the total number of oocytes and embryos/OR (RR) and the number of embryos/OR (ERR). Data was analyzed by one-way ANOVA. No differences were observed (p>0.05) for OR, TEMB or FEMB between seasons despite higher RR (p<0.05) and ERR (p<0.01) being obtained in spring. No differences (p>0.05) were found in OR and number of ewes with superovulatory response (>4 CL). Total number of embryos recovered per donor, RR and ERR, were higher (p<0.05) in oFSH-treated ewes. Data from these studies suggest that MOET programs can be used with success in Black Merino ewes, in southern Portugal, independently of the season of the year, with better results obtained when purified ovine FSH was used

Keywords

Sheep; Superovulation; Black Merino; Season; Embryos

Tipo de Apresentação
Comunicação oral
Tipo de Revisão
Sem revisão
Âmbito Geográfico
Internacional
Situação
Publicado
Área de Trabalho
Referência

Bettencourt, E.; Bettencourt, C.; Ferreira, P.; Manito, C.; Matos, C.; Rocha, A.; Romão, R.; Silva, N. (2006). Superovulatory response of Portuguese Black Merino Ewes varies with FSH source, but not with season. X Annual Conference of the European Society for Domestic Animal Reproduction (Proceedings in Reproduction in Domestic Animals, vol 41 pp.310-310).