Currin Luke, Baldassarre Hernan, de Macedo Mariana Priotto, Glanzner Werner Giehl, Gutierrez Karina, Lazaris Katerina, Guay Vanessa, Herrera María Elena Carrillo, da Silva Zigomar, Brown Caitlin, Joron Erin, Herron Ron, Bordignon Vilceu
Department of Animal Science, McGill University, Sainte-Anne-de-Bellevue, QC H9X 3V9, Canada.
Laboratory of Biotechnology and Animal Reproduction-BioRep, Federal University of Santa Maria, Santa Maria 97105-900, RS, Brazil.
Animals (Basel). 2022 Dec 15;12(24):3549. doi: 10.3390/ani12243549.
Embryos from prepubertal water buffalo can be produced using laparoscopic ovum pickup (LOPU) and in vitro embryo production (IVEP). However, to date, it is unclear what factors and environmental conditions can affect LOPU-IVEP efficiency in prepubertal animals, especially buffalo. In this study, we explored the impact of season, age and individual variation among female donor animals, as well as the effect of the sire used for in vitro fertilization. Donor animals between 2 and 6 months of age were stimulated using gonadotropins prior to LOPU, which was performed at two-week intervals. Following in vitro maturation and fertilization, the resulting embryos were then cultured to the blastocyst stage until they were either vitrified or transferred into recipient animals. The number of follicles available for aspiration and embryo development rates was stable throughout the year. As animals became older, there was a slight trend for fewer COCs recovered from LOPU and better embryo development. There was a large individual variation in both ovarian response and the developmental competence of oocytes among donors. The bull used for fertilization also had a significant impact on embryo development. Upon embryo transfer, pregnancy rates were not affected by the number of embryos transferred per recipient. The best pregnancy rates were achieved when transferring blastocysts, compared to compact morula or hatched blastocysts. Finally, vitrification had no effect on pregnancy rate compared to fresh embryos.
可通过腹腔镜采卵(LOPU)和体外胚胎生产(IVEP)技术获得青春期前水牛的胚胎。然而,迄今为止,尚不清楚哪些因素和环境条件会影响青春期前动物(尤其是水牛)的LOPU-IVEP效率。在本研究中,我们探讨了季节、年龄以及雌性供体动物个体差异的影响,以及用于体外受精的父本的影响。在LOPU之前,使用促性腺激素对2至6月龄的供体动物进行刺激,采卵每隔两周进行一次。经过体外成熟和受精后,将得到的胚胎培养至囊胚阶段,然后进行玻璃化冷冻或移植到受体动物体内。全年可用于抽吸的卵泡数量和胚胎发育率保持稳定。随着动物年龄的增长,从LOPU回收的卵丘-卵母细胞复合体(COC)数量略有减少的趋势,且胚胎发育情况更好。供体之间的卵巢反应和卵母细胞发育能力存在很大的个体差异。用于受精的公牛对胚胎发育也有显著影响。在胚胎移植时,每个受体移植的胚胎数量对妊娠率没有影响。与致密桑葚胚或孵化囊胚相比,移植囊胚时获得的妊娠率最高。最后,与新鲜胚胎相比,玻璃化冷冻对妊娠率没有影响。