Hormonal protocols for in vitro production of Zebu and taurine embryos
| Autor: | Carlos Antônio de Carvalho Fernandes, Tatimara Maria Miyauchi, Ana Cristina Silva de Figueiredo, Miller Pereira Palhão, Fabiana Cristina Varago, Ester Siqueira Caixeta Nogueira, Jairo Pereira Neves, Tochimara Aparecida Miyauchi |
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| Jazyk: | English<br />Spanish; Castilian<br />Portuguese |
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Pesquisa Agropecuária Brasileira, Vol 49, Iss 10, Pp 813-817 (2014) |
| Druh dokumentu: | article |
| ISSN: | 1678-3921 0100-204X |
| DOI: | 10.1590/S0100-204X2014001000008 |
| Popis: | The objective of this work was to evaluate the effects of hormonal synchronization protocols, associated or not with follicular development stimulation, on the recovery of oocytes and on in vitro production of Bos indicus and B. taurus embryos, in different seasons. Ultrasound-guided follicular aspirations (n=237) were performed without pre-treatment (G1, control group) and after follicular wave synchronization (G2), or after follicular wave synchronization and follicle growth induction (G3). Bos indicus produced more oocytes and embryos than B. taurus (18.7±0.9 vs. 11.9±0.6 oocytes and 4.8±0.3 vs. 2.1±0.2 embryos). On average, oocyte and embryo yields were higher in G3 than in G2, and both were greater than in G1, which lead to a higher conversion of oocytes to embryos in these treatments. The hot or the cold season did not affect the B. indicus outcomes, whereas, in B. taurus, both oocyte recovery and embryo production were higher in the cold season. Follicular wave synchronization improves ovum pick-up and in vitro production of embryos in both cattle subspecies evaluated. |
| Databáze: | Directory of Open Access Journals |
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